The last scene with Lapp was very sad. I was reminded of a scene in the movie Das Boot In which they submarine was sinking uncontrollably. It was a reporter who had been assigned to be with the crew, and as the boat was sinking he withdrew to his rack and turned on a flashlight to look at a photograph of his family while in the background you can hear the anguished cries of the other crewmen.
In That case, at least, they survived. Even though the submarine was well beyond is design specs for depth, it did survive and they were able to make enough repairs to get back to port.