Can You Teach Me How to Breathe

Four people are on a submarine that is sinking. They are not sure why it is sinking and their only source of information is a message from the BBC world service that tells them help is on the way. 

But, with everything that they should know about themselves and their situation just out of reach, the circumstances become increasingly dire. 

Messages from the outside world begin to trickle in but do not promise salvation and become more and more ominous. 

The crew must figure out how to escape their fate or else accept it, and there is something out there pushing on the walls.