A friend of the passenger Hamish Harding was going to go as well but bailed because he thought it unsafe. Add using old scaffolding poles to the list.

And Chris revealed further unease due to technical issues and delays, which left him questioning whether or not the firm was ­cutting corners.

Chris said: “I found out they used old scaffolding poles for the sub’s ballast — and its controls were based on computer game-style controllers.

“If you’re trying to build your own submarine you could probably use old scaffold poles. But this was a commercial craft.

“Eventually I emailed them and said, ‘I’m no longer able to go on this thing’. I asked for a refund after being less than convinced.”

https://www.the-sun.com/news/8416758/missing-titanic-submarine-pulled-out-safety/