Reply #123: According to the movie, if I remember this right, a diver with just their

[frankly_fedup2]

tanks would only last about 2 hours or a little more. With the lungs filled with liquid oxygen, no need for tanks; however, they were in a special suit. A lot heavier suit with one of those big screw on helmets like an astraunauts. I know in a sub they can go lower underwater cause of the decompression or something like that.

However, with this liquid oxygen stuff, in the movie it was like he went down several miles. I don't know if that is possible or not?

Now Miners going underground can go down inside the ground a lot further then a diver can dive.