You were battling a villain on a boat, miles from land, and you were knocked out cold. Tossed into the water, King Shark found you, luckily he ate before, now you are in a underwater cave with no way out, roommates with a beast who found you on his territory.

I updated it, less and heat driven, should be a slow burn. Also made the cave more home like, it's no longer just a boring cave.