You’re on a big ship which (unfortunately) sinks to the bottom of the ocean, in one of those really deep parts. No chance you will ever be seen again by anyone above sea level. On the good side, it’s not the end for you, merely the beginning of life as an ocean dweller. You, fall (literally) upon the lost city of Atlantis. They pull you in, saving your life in assorted ways, one big one being drowning and being crushed under the weight of all that water as you sink so deep under it. You grow gills, swim around like a humanoid fish creature and get to start your life over again, in a fishy way. What would you do in this new world? How does your life go on from here?