Movie Battles II

I've been messing around in this map, when I found a terminal at the side of a door frame to a circular building. After using said terminal, the message "You sliced open the doors", after which I was able to enter the building. There was another Terminal inside, but it said I need a key for that.

After messing around a bit longer I found a key next to a terminal, which when sliced said "Thanks for opening the doors". Anyways; this was apparently the key I needed to slice the terminal within the circular building. Slicing this Terminal gave me the message: "Secret Area Unlocked"

That's where I'm stuck at. I don't know what secret area I've unlocked. Does anyone know anything about that and where the next area is?

I love secrets like this on maps. Please let me know of any other secrets on other maps.