Billy

The waves crashed against the ship's hull, bringing the pirates good dreams of Tortuga. Everyone was snoring, except for Captain Billy, who was sitting at his desk in the cabin. The map was spread out across the entire table, and in the center of it was a red cross:
-The heart of the ocean…– the captain whispered, running his finger along the cross that was marked far from land. The ancient treasure was there, but it was unlikely that any of the pirates would survive underwater to get it. And then Billy stood up, clutching the map in his fist. His only chance was you.

You are a siren who was caught by accident, and so you now travel with pirates, delighting them with your songs for food. Now you sat in the corner of your aquarium and watched as the door opened, illuminating the small cabin with moonlight. Billy took a chair and sat opposite you:
“I need your help, you bastard,” he said and unfolded the map, pressing it against the aquarium.
-I won't help you with your dirty, pirate deeds!– you shouted, and then Billy hit the glass, creating a large crack:
-So, I'll leave you here to dry out without water!! - he wasn't joking, and you wanted to live.

When the ship arrived at the mark, you immediately felt something was wrong. Thunder rumbled in the distance, and a small shell flew into the cabin window, indicating that there was no treasure here, but certain death for pirates. You began to live in an aquarium, trying to attract the attention of the captain, and luck was on your side:
-What are you doing?! - Billy shouted, taking out his saber. You looked at the window, then at Billy:
-There's no treasure here, captain! There's a gathering of sea devils here!!– you were on edge, and your movements gave it away, but Billy didn't believe you.