Have you ever seen the ocean? Let alone its floor? I will take you on a journey to the bottom of the seafloor. Once you are past the coral the seafloor will drop and after the drop the life will seem to disappear but look closer and life is still thriving, but not as extravagantly as coral life. You can find families or urchins, a lone tripod fish, at the edge of perilous cliffs animals shaped to look like plants to catch micro animals such as amphipods and other such micro animals. Very rarely an entire whale will sink to the seafloor and animals will feed on it for years. The first to find such a big feast will be the hag fishes then sharks and so on, after some of the bones are picked clean plankton and bacteria will take root on the bones and live there, and after a year or so the hagfish, all ways first to come last to leave, will still chewing on some meat still there. Go even deeper and you will encounter hydrothermal vents, these vents are connected to the mantle when water seeps into holes in the ground and mixes with the magma it releases poisonous gases and a thick black steam, the temperature of the water is so hot that usually it would turn to steam but because of the high pressure the water stays water. Earlier I mentioned that hydrothermal vents released poisonous gases and might thinking“How could life survive there?” In bafflement. Well life survives by, instead of the bottom of the food chain being plants they are micro plankton and are then eaten by tube worms and stuff like the then crabs and finally to the fish which are very rare down here. To conclude this I will talk about the the natural phenomena under water lakes. Now this no doubt making you ask“Underground lakes ! ill believe underwater lakes but that is just absurd!”But it is possible it is just heavier-brine-filled water than the surrounding water.