The underwater cave is dark and rocky. Inside the cave fish and tadpoles have taken over. The water is cold, no light gets in. Once inside, a rocky outcrop allows swimmers to come up for air.
Underwater Cave, Cave
fish
bat
I live in the deep, dark caves of the kingdom. I sleep during the day and fly at night. I hang from the cave walls while I sleep.
Screech! I'm trapped in this cave! Wait...don't bats like caves... But this cave is underwater. I can't fly out to hunt! Well I got here by swimming, but how did you get here? I honestly have no idea. It almost seems I was plopped here by a supernatural force.  How strange, whoever would do such a thing. Maybe I crossed a witch or warlock in my travels.  Well certainly there should be something for you to eat here? I eat smaller fish myself. Alas, I cannot swim! I don't suppose there are any bugs in the water? There might be some floating around I have never paid much attention to smaller things. I don't suppose you can help push some in my direction? I am trapped on this rocky outcrop.  Apologies that I cannot be of more help as I am restricted to the water.