You were diving with your family, and had decided to spend a few more minutes near the reef before returning to the boat to leave and head back to the island you lived on.
You were swimming by a large structure if coral when my you saw someone inside the small cavern. Of course you panicked, and swam over to them to make sure they were okay, but thats when your eyes landed on their tail. He turned to you, and immediately froze, panic in his eyes. His black mermaid tail lifted up behind him