I'm not really into text based games but the ambiance you layed out made it enjoyable for me. I found interesting the idea of a crew being stuck underwater, and the way you approached the telling of the story by distinct characters was well crafted. The art style and the color palette you used reminded me of an imaginray dark cartoon network show of the late 90'. The contrast between the serious themes of the game and the visual is really efficient and conveys a sort of uneasiness to the whole.
Maybe it was lacking some more interaction with the submarine or some mini game putting you a bit more in the shoes of a crew member., but that"s only according to my tastes.
You've got here a great complete short piece that shines in the audio, visual and overall coherence, congrats !