Death by spontaneous explosion?! I hate it when that happens.
Nice game! I played it twice. It had a very particular atmosphere to it. I liked playing the tapes as the sub went down to keep me entertained during the slow parts, but sometimes they were hard to hear.
I died by the tentacles crushing the vessel on my first playthrough. I couldn't figure out what I'm supposed to do with those after I patched all the glass cracks. I just watched my hull slowly drain. Figuring it out on the second playthrough was nice.
Parts did get repetitive, but overall, really nice game jam submission. Good work!