The way the song weaves in and out each measure like the waves of the ocean is really cool. The static sounds like waves crashing overhead and it panning from ear to ear adds so much atmosphere to the whole piece.
I really liked when it sped up and I also imagined the little clicks in each ear being sensors on the submarine reacting to things outside.
Finally, the echoing noise in the back is really neat like the metal of the submarine is coming into contact with various obstacles.
very cool song.