- published: 27 Apr 2013
- views: 2335
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Learn about what research is done on the oceans, and what physics is used to do this.
This lecture was presented in February, 2010 to the ECE Department at the University of Utah as part of the Frontiers in Engineering Innovation lecture series.
Dr. T. C. Yang has been with the Naval Research Laboratory, Washington DC, since 1979. He acted as the branch head of the signal processing branch for the last five years and is now a senior scientist and consultant in the acoustic division. Besides conducting underwater acoustic and acoustic oceanographic related research, he has also worked on sonar signal processing including the matched mode processing for a vertical line array and matched-beam processing for a horizontal line array. For the last ten years, his research is concentrated on environmental impact on underwater acoustic communications. He is a fellow of the Acoustical Society of America.
- published: 10 Oct 2011
- views: 6184
A fluid is a gas or a liquid. Compression-expansion waves in a fluid are called acoustic waves. These waves involve the propagation of changes in density, pressure, and temperature. Acoustic waves also occur in solids and plasmas, but these substances are more complicated because a variety of other types of waves can also exist (for example, shear waves).
This entire course will deal with linear acoustics, which involves small
deviations of the density. The study of finite-amplitude deviations is called nonlinear acoustics. Many new and more-complicated phenomena occur in nonlinear acoustics, and it is best to understand linear acoustics before studying nonlinear acoustics. The elective course PH4459 (nonlinear oscillations and waves) is taught every spring quarter and is open to all students who have had introductory physics and differential equations.
This course includes nonlinear acoustics as well as other nonlinear
oscillatory systems. Acoustics is actually a special case of fluid dynamics. Because acoustics is so broad, however, it is usually considered to be a separate subject.
Some of the different fields of acoustics are: physical (fundamental)
acoustics, underwater acoustics, architectural acoustics, musical acoustics, structural acoustics, acoustic transducers, physiological and psychological acoustics, animal acoustics, and insect acoustics. A new field, which can be called environmental acoustics, is rapidly becoming important due to importance of detrimental sound. (This field was previously called acoustic noise). Acousticians are everywhere, and there will always be a need for
them!
FLUID DESCRIPTION
A proper understanding of acoustics begins with fluid dynamics. We
consider a fluid particle that has a fixed amount of mass. A fluid particle is small compared to the length scale of changes in the fluid but contains very many molecules.
- published: 02 Dec 2014
- views: 6004
This four-day course is designed for biologists, and conservation managers, who wish to enhance their understanding of the underlying principles of underwater and engineering acoustics needed to evaluate the impact of anthropogenic noise on marine life. This course provides a framework for making objective assessments of the impact of various types of sound sources. Critical topics are introduced through clear and readily understandable heuristic models and graphics.
- published: 31 Jan 2011
- views: 514
Underwater acoustics
Underwater acoustics is the study of the propagation of sound in water and the interaction of the mechanical waves that constitute sound with the water and its boundaries. The water may be in the ocean, a lake or a tank. Typical frequencies associated with underwater acoustics are between 10 Hz and 1 MHz. The propagation of sound in the ocean at frequencies lower than 10 Hz is usually not possible without penetrating deep into the seabed, whereas frequencies above 1 MHz are rarely used because they are absorbed very quickly. Underwater acoustics is sometimes known as hydroacoustics.
The field of underwater acoustics is closely related to a number of other fields of acoustic study, including sonar, transduction, acoustic signal processing, acoustical oceanography, bioacoustics, and physical acoustics.
History
Underwater sound has probably been used by marine animals for millions of years. The science of underwater acoustics began in 1490, when Leonardo da Vinci wrote the following,
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https://wn.com/Underwater_acoustics
This article is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License, which means that you can copy and modify it as long as the entire work (including additions) remains under this license.
This article is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License, which means that you can copy and modify it as long as the entire work (including additions) remains under this license.
Underwater
Underwater refers to the region below the surface of water where the water exists in a natural feature (called a body of water) such as an ocean, sea, lake, pond, or river.
Extent
Three quarters of the planet Earth is covered by water. A majority of the planet's solid surface is abyssal plain, at depths between 4,000 and 5,500 metres (13,100 and 18,000 ft) below the surface of the oceans. The solid surface location on the planet closest to the centre of the orb is the Challenger Deep, located in the Mariana Trench at a depth of 10,924 metres (35,840 ft). Although a number of human activities are conducted underwater—such as research, scuba diving for work or recreation, or even underwater warfare with submarines, this very extensive environment on planet Earth is hostile to humans in many ways and therefore little explored. But it can be explored by sonar, or more directly via manned or autonomous submersibles. The ocean floors have been surveyed via sonar to at least a coarse resolution; particularly-strategic areas have been mapped in detail, in the name of detecting enemy submarines, or aiding friendly ones, though the resulting maps may still be classified.
This page contains text from Wikipedia, the Free Encyclopedia -
https://wn.com/Underwater
This article is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License, which means that you can copy and modify it as long as the entire work (including additions) remains under this license.
This article is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License, which means that you can copy and modify it as long as the entire work (including additions) remains under this license.
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3:28What's In Our Oceans? : Underwater Acoustics
What's In Our Oceans? : Underwater AcousticsWhat's In Our Oceans? : Underwater Acoustics
Learn about what research is done on the oceans, and what physics is used to do this. -
6:30PH3452: Underwater Acoustics - Waveguide Part 1
PH3452: Underwater Acoustics - Waveguide Part 1PH3452: Underwater Acoustics - Waveguide Part 1
PH3452: Underwater Acoustics - Waveguide Part 1 -
52:07Underwater Acoustic Communications: Channel Physics and Implications
Underwater Acoustic Communications: Channel Physics and ImplicationsUnderwater Acoustic Communications: Channel Physics and Implications
This lecture was presented in February, 2010 to the ECE Department at the University of Utah as part of the Frontiers in Engineering Innovation lecture series. Dr. T. C. Yang has been with the Naval Research Laboratory, Washington DC, since 1979. He acted as the branch head of the signal processing branch for the last five years and is now a senior scientist and consultant in the acoustic division. Besides conducting underwater acoustic and acoustic oceanographic related research, he has also worked on sonar signal processing including the matched mode processing for a vertical line array and matched-beam processing for a horizontal line array. For the last ten years, his research is concentrated on environmental impact on underwater acoustic communications. He is a fellow of the Acoustical Society of America. -
53:57NPS Physics - Ph 3451: Acoustics - Lecture 1 - Introduction | fluid description | equation of state
NPS Physics - Ph 3451: Acoustics - Lecture 1 - Introduction | fluid description | equation of stateNPS Physics - Ph 3451: Acoustics - Lecture 1 - Introduction | fluid description | equation of state
A fluid is a gas or a liquid. Compression-expansion waves in a fluid are called acoustic waves. These waves involve the propagation of changes in density, pressure, and temperature. Acoustic waves also occur in solids and plasmas, but these substances are more complicated because a variety of other types of waves can also exist (for example, shear waves). This entire course will deal with linear acoustics, which involves small deviations of the density. The study of finite-amplitude deviations is called nonlinear acoustics. Many new and more-complicated phenomena occur in nonlinear acoustics, and it is best to understand linear acoustics before studying nonlinear acoustics. The elective course PH4459 (nonlinear oscillations and waves) is taught every spring quarter and is open to all students who have had introductory physics and differential equations. This course includes nonlinear acoustics as well as other nonlinear oscillatory systems. Acoustics is actually a special case of fluid dynamics. Because acoustics is so broad, however, it is usually considered to be a separate subject. Some of the different fields of acoustics are: physical (fundamental) acoustics, underwater acoustics, architectural acoustics, musical acoustics, structural acoustics, acoustic transducers, physiological and psychological acoustics, animal acoustics, and insect acoustics. A new field, which can be called environmental acoustics, is rapidly becoming important due to importance of detrimental sound. (This field was previously called acoustic noise). Acousticians are everywhere, and there will always be a need for them! FLUID DESCRIPTION A proper understanding of acoustics begins with fluid dynamics. We consider a fluid particle that has a fixed amount of mass. A fluid particle is small compared to the length scale of changes in the fluid but contains very many molecules. -
3:42PH3452: Underwater Acoustics - Surface Interference Part 1
PH3452: Underwater Acoustics - Surface Interference Part 1PH3452: Underwater Acoustics - Surface Interference Part 1
PH3452: Underwater Acoustics - Surface Interference Part 1 -
3:13Underwater Acoustics
Underwater AcousticsUnderwater Acoustics
-
3:09Underwater acoustics 2
Underwater acoustics 2Underwater acoustics 2
-
0:16An Introduction to Underwater Acoustics
An Introduction to Underwater AcousticsAn Introduction to Underwater Acoustics
-
0:36Underwater Acoustics Analysis, Design and Performance of Sonar
Underwater Acoustics Analysis, Design and Performance of SonarUnderwater Acoustics Analysis, Design and Performance of Sonar
-
9:49Underwater Acoustics for Biologists and Conservation Managers
Underwater Acoustics for Biologists and Conservation ManagersUnderwater Acoustics for Biologists and Conservation Managers
This four-day course is designed for biologists, and conservation managers, who wish to enhance their understanding of the underlying principles of underwater and engineering acoustics needed to evaluate the impact of anthropogenic noise on marine life. This course provides a framework for making objective assessments of the impact of various types of sound sources. Critical topics are introduced through clear and readily understandable heuristic models and graphics.
-
What's In Our Oceans? : Underwater Acoustics
Learn about what research is done on the oceans, and what physics is used to do this.
published: 27 Apr 2013 -
PH3452: Underwater Acoustics - Waveguide Part 1
PH3452: Underwater Acoustics - Waveguide Part 1
published: 08 Jan 2015 -
Underwater Acoustic Communications: Channel Physics and Implications
This lecture was presented in February, 2010 to the ECE Department at the University of Utah as part of the Frontiers in Engineering Innovation lecture series. Dr. T. C. Yang has been with the Naval Research Laboratory, Washington DC, since 1979. He acted as the branch head of the signal processing branch for the last five years and is now a senior scientist and consultant in the acoustic division. Besides conducting underwater acoustic and acoustic oceanographic related research, he has also worked on sonar signal processing including the matched mode processing for a vertical line array and matched-beam processing for a horizontal line array. For the last ten years, his research is concentrated on environmental impact on underwater acoustic communications. He is a fellow of the Acoustic...
published: 10 Oct 2011 -
NPS Physics - Ph 3451: Acoustics - Lecture 1 - Introduction | fluid description | equation of state
A fluid is a gas or a liquid. Compression-expansion waves in a fluid are called acoustic waves. These waves involve the propagation of changes in density, pressure, and temperature. Acoustic waves also occur in solids and plasmas, but these substances are more complicated because a variety of other types of waves can also exist (for example, shear waves). This entire course will deal with linear acoustics, which involves small deviations of the density. The study of finite-amplitude deviations is called nonlinear acoustics. Many new and more-complicated phenomena occur in nonlinear acoustics, and it is best to understand linear acoustics before studying nonlinear acoustics. The elective course PH4459 (nonlinear oscillations and waves) is taught every spring quarter and is open to all stude...
published: 02 Dec 2014 -
PH3452: Underwater Acoustics - Surface Interference Part 1
PH3452: Underwater Acoustics - Surface Interference Part 1
published: 06 Feb 2014 -
Underwater Acoustics
published: 24 Oct 2016 -
Underwater acoustics 2
published: 24 Oct 2016 -
An Introduction to Underwater Acoustics
published: 19 Sep 2016 -
Underwater Acoustics Analysis, Design and Performance of Sonar
published: 27 Jun 2017 -
Underwater Acoustics for Biologists and Conservation Managers
This four-day course is designed for biologists, and conservation managers, who wish to enhance their understanding of the underlying principles of underwater and engineering acoustics needed to evaluate the impact of anthropogenic noise on marine life. This course provides a framework for making objective assessments of the impact of various types of sound sources. Critical topics are introduced through clear and readily understandable heuristic models and graphics.
published: 31 Jan 2011
What's In Our Oceans? : Underwater Acoustics
- Order: Reorder
- Duration: 3:28
- Updated: 27 Apr 2013
- views: 2335
Learn about what research is done on the oceans, and what physics is used to do this.
Learn about what research is done on the oceans, and what physics is used to do this.
https://wn.com/What's_In_Our_Oceans_Underwater_Acoustics
Learn about what research is done on the oceans, and what physics is used to do this.
- published: 27 Apr 2013
- views: 2335
PH3452: Underwater Acoustics - Waveguide Part 1
- Order: Reorder
- Duration: 6:30
- Updated: 08 Jan 2015
- views: 596
PH3452: Underwater Acoustics - Waveguide Part 1
PH3452: Underwater Acoustics - Waveguide Part 1
https://wn.com/Ph3452_Underwater_Acoustics_Waveguide_Part_1
Underwater Acoustic Communications: Channel Physics and Implications
- Order: Reorder
- Duration: 52:07
- Updated: 10 Oct 2011
- views: 6184
This lecture was presented in February, 2010 to the ECE Department at the University of Utah as part of the Frontiers in Engineering Innovation lecture series.
...
This lecture was presented in February, 2010 to the ECE Department at the University of Utah as part of the Frontiers in Engineering Innovation lecture series.
Dr. T. C. Yang has been with the Naval Research Laboratory, Washington DC, since 1979. He acted as the branch head of the signal processing branch for the last five years and is now a senior scientist and consultant in the acoustic division. Besides conducting underwater acoustic and acoustic oceanographic related research, he has also worked on sonar signal processing including the matched mode processing for a vertical line array and matched-beam processing for a horizontal line array. For the last ten years, his research is concentrated on environmental impact on underwater acoustic communications. He is a fellow of the Acoustical Society of America.
https://wn.com/Underwater_Acoustic_Communications_Channel_Physics_And_Implications
This lecture was presented in February, 2010 to the ECE Department at the University of Utah as part of the Frontiers in Engineering Innovation lecture series.
Dr. T. C. Yang has been with the Naval Research Laboratory, Washington DC, since 1979. He acted as the branch head of the signal processing branch for the last five years and is now a senior scientist and consultant in the acoustic division. Besides conducting underwater acoustic and acoustic oceanographic related research, he has also worked on sonar signal processing including the matched mode processing for a vertical line array and matched-beam processing for a horizontal line array. For the last ten years, his research is concentrated on environmental impact on underwater acoustic communications. He is a fellow of the Acoustical Society of America.
- published: 10 Oct 2011
- views: 6184
NPS Physics - Ph 3451: Acoustics - Lecture 1 - Introduction | fluid description | equation of state
- Order: Reorder
- Duration: 53:57
- Updated: 02 Dec 2014
- views: 6004
A fluid is a gas or a liquid. Compression-expansion waves in a fluid are called acoustic waves. These waves involve the propagation of changes in density, press...
A fluid is a gas or a liquid. Compression-expansion waves in a fluid are called acoustic waves. These waves involve the propagation of changes in density, pressure, and temperature. Acoustic waves also occur in solids and plasmas, but these substances are more complicated because a variety of other types of waves can also exist (for example, shear waves).
This entire course will deal with linear acoustics, which involves small
deviations of the density. The study of finite-amplitude deviations is called nonlinear acoustics. Many new and more-complicated phenomena occur in nonlinear acoustics, and it is best to understand linear acoustics before studying nonlinear acoustics. The elective course PH4459 (nonlinear oscillations and waves) is taught every spring quarter and is open to all students who have had introductory physics and differential equations.
This course includes nonlinear acoustics as well as other nonlinear
oscillatory systems. Acoustics is actually a special case of fluid dynamics. Because acoustics is so broad, however, it is usually considered to be a separate subject.
Some of the different fields of acoustics are: physical (fundamental)
acoustics, underwater acoustics, architectural acoustics, musical acoustics, structural acoustics, acoustic transducers, physiological and psychological acoustics, animal acoustics, and insect acoustics. A new field, which can be called environmental acoustics, is rapidly becoming important due to importance of detrimental sound. (This field was previously called acoustic noise). Acousticians are everywhere, and there will always be a need for
them!
FLUID DESCRIPTION
A proper understanding of acoustics begins with fluid dynamics. We
consider a fluid particle that has a fixed amount of mass. A fluid particle is small compared to the length scale of changes in the fluid but contains very many molecules.
https://wn.com/Nps_Physics_Ph_3451_Acoustics_Lecture_1_Introduction_|_Fluid_Description_|_Equation_Of_State
A fluid is a gas or a liquid. Compression-expansion waves in a fluid are called acoustic waves. These waves involve the propagation of changes in density, pressure, and temperature. Acoustic waves also occur in solids and plasmas, but these substances are more complicated because a variety of other types of waves can also exist (for example, shear waves).
This entire course will deal with linear acoustics, which involves small
deviations of the density. The study of finite-amplitude deviations is called nonlinear acoustics. Many new and more-complicated phenomena occur in nonlinear acoustics, and it is best to understand linear acoustics before studying nonlinear acoustics. The elective course PH4459 (nonlinear oscillations and waves) is taught every spring quarter and is open to all students who have had introductory physics and differential equations.
This course includes nonlinear acoustics as well as other nonlinear
oscillatory systems. Acoustics is actually a special case of fluid dynamics. Because acoustics is so broad, however, it is usually considered to be a separate subject.
Some of the different fields of acoustics are: physical (fundamental)
acoustics, underwater acoustics, architectural acoustics, musical acoustics, structural acoustics, acoustic transducers, physiological and psychological acoustics, animal acoustics, and insect acoustics. A new field, which can be called environmental acoustics, is rapidly becoming important due to importance of detrimental sound. (This field was previously called acoustic noise). Acousticians are everywhere, and there will always be a need for
them!
FLUID DESCRIPTION
A proper understanding of acoustics begins with fluid dynamics. We
consider a fluid particle that has a fixed amount of mass. A fluid particle is small compared to the length scale of changes in the fluid but contains very many molecules.
- published: 02 Dec 2014
- views: 6004
PH3452: Underwater Acoustics - Surface Interference Part 1
- Order: Reorder
- Duration: 3:42
- Updated: 06 Feb 2014
- views: 319
Underwater Acoustics
- Order: Reorder
- Duration: 3:13
- Updated: 24 Oct 2016
- views: 63
- published: 24 Oct 2016
- views: 63
Underwater acoustics 2
- Order: Reorder
- Duration: 3:09
- Updated: 24 Oct 2016
- views: 91
- published: 24 Oct 2016
- views: 91
An Introduction to Underwater Acoustics
- Order: Reorder
- Duration: 0:16
- Updated: 19 Sep 2016
- views: 12
- published: 19 Sep 2016
- views: 12
Underwater Acoustics Analysis, Design and Performance of Sonar
- Order: Reorder
- Duration: 0:36
- Updated: 27 Jun 2017
- views: 0
- published: 27 Jun 2017
- views: 0
Underwater Acoustics for Biologists and Conservation Managers
- Order: Reorder
- Duration: 9:49
- Updated: 31 Jan 2011
- views: 514
This four-day course is designed for biologists, and conservation managers, who wish to enhance their understanding of the underlying principles of underwater a...
This four-day course is designed for biologists, and conservation managers, who wish to enhance their understanding of the underlying principles of underwater and engineering acoustics needed to evaluate the impact of anthropogenic noise on marine life. This course provides a framework for making objective assessments of the impact of various types of sound sources. Critical topics are introduced through clear and readily understandable heuristic models and graphics.
https://wn.com/Underwater_Acoustics_For_Biologists_And_Conservation_Managers
This four-day course is designed for biologists, and conservation managers, who wish to enhance their understanding of the underlying principles of underwater and engineering acoustics needed to evaluate the impact of anthropogenic noise on marine life. This course provides a framework for making objective assessments of the impact of various types of sound sources. Critical topics are introduced through clear and readily understandable heuristic models and graphics.
- published: 31 Jan 2011
- views: 514
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3:28
What's In Our Oceans? : Underwater Acoustics
Learn about what research is done on the oceans, and what physics is used to do this.
published: 27 Apr 2013
What's In Our Oceans? : Underwater Acoustics
What's In Our Oceans? : Underwater Acoustics
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- published: 27 Apr 2013
- views: 2335
6:30
PH3452: Underwater Acoustics - Waveguide Part 1
PH3452: Underwater Acoustics - Waveguide Part 1
published: 08 Jan 2015
PH3452: Underwater Acoustics - Waveguide Part 1
PH3452: Underwater Acoustics - Waveguide Part 1
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- published: 08 Jan 2015
- views: 596
52:07
Underwater Acoustic Communications: Channel Physics and Implications
This lecture was presented in February, 2010 to the ECE Department at the University of Ut...
published: 10 Oct 2011
Underwater Acoustic Communications: Channel Physics and Implications
Underwater Acoustic Communications: Channel Physics and Implications
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- published: 10 Oct 2011
- views: 6184
53:57
NPS Physics - Ph 3451: Acoustics - Lecture 1 - Introduction | fluid description | equation of state
A fluid is a gas or a liquid. Compression-expansion waves in a fluid are called acoustic w...
published: 02 Dec 2014
NPS Physics - Ph 3451: Acoustics - Lecture 1 - Introduction | fluid description | equation of state
NPS Physics - Ph 3451: Acoustics - Lecture 1 - Introduction | fluid description | equation of state
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- published: 02 Dec 2014
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3:42
PH3452: Underwater Acoustics - Surface Interference Part 1
PH3452: Underwater Acoustics - Surface Interference Part 1
published: 06 Feb 2014
PH3452: Underwater Acoustics - Surface Interference Part 1
PH3452: Underwater Acoustics - Surface Interference Part 1
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3:13
Underwater Acoustics
published: 24 Oct 2016
Underwater Acoustics
Underwater Acoustics
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- views: 63
3:09
Underwater acoustics 2
published: 24 Oct 2016
Underwater acoustics 2
Underwater acoustics 2
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0:16
An Introduction to Underwater Acoustics
published: 19 Sep 2016
An Introduction to Underwater Acoustics
An Introduction to Underwater Acoustics
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0:36
Underwater Acoustics Analysis, Design and Performance of Sonar
published: 27 Jun 2017
Underwater Acoustics Analysis, Design and Performance of Sonar
Underwater Acoustics Analysis, Design and Performance of Sonar
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- published: 27 Jun 2017
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9:49
Underwater Acoustics for Biologists and Conservation Managers
This four-day course is designed for biologists, and conservation managers, who wish to en...
published: 31 Jan 2011
Underwater Acoustics for Biologists and Conservation Managers
Underwater Acoustics for Biologists and Conservation Managers
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- published: 31 Jan 2011
- views: 514
What's In Our Oceans? : Underwater Acoustics...
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Underwater Acoustic Communications: Channel Physic...
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PH3452: Underwater Acoustics - Surface Interferen...
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An Introduction to Underwater Acoustics...
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Authorities ID 20-year-old who was trapped underwater in James River
Edit Richmond Times Dispatch 17 Jul 2017
Authorities have released the name of the man who died and was pulled from the James River on Saturday after being underwater for more than an hour. His name is Rudy Organiz-Aguilon, 20, of the 100 block of North Laburnum Avenue. This has been a breaking news update. Check back for details. Authorities have confirmed the death of a man who was pulled from the James River on Saturday after being underwater for more than an hour ... ....
Harry Styles : Hard to complain about 'Dunkirk' underwater scenes
Edit The Times of India 17 Jul 2017
Singer Harry Styles said he cannot complain about shooting underwater scenes in upcoming film 'Dunkirk' as it was nothing compared to what the real soldiers would have gone through during World War II ... Harry Styles skips 'Dunkirk' after-party for friends ... It was so real ... The 'Sign Of The Times' singer added he panicked while shooting the underwater scenes ... It's so much that human instinct, that point of being underwater ... 130 ... “ ... L-O-V-E" ... ”....
Fearless freediver captures stunning shots of killer whales to show how 'cautious and gentle' they can be
Edit This is Money 17 Jul 2017- 1
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