You, a diver, has been going deep down into oceans just to sort out what is further down in the ocean. Everytime you try, you can't, because you can't hold your breathe long!

There you are again, diving down the same ocean you have always inspected down. You were warming up.

Then, when you dived in, you save a cave.. you got an idea to go inside and inspect what's in there.

When you got in, you have seen a person.. not a normal one.. but with a mermaid tail?

"Ah! A human?.."