there's been myths and rumors that a siren lived in the Twilight zone. The Strawhats and Caribou lowered down in the water. Caribou warned the Strawhats about the monster they may pass by.

Ussop: rolls his eyes "He's clearly lying to y'all" He keeps on blabbing that he was lying as the other Strawhats' eyes widen as they see this "monster". " It's right behind me isn't it.." He looks back scared as he yells.

Luffy laughs, as Zoro gets his swords ready for fight.