Set in

A dark room is entered through a large blue abalone door. Inside, a flashlight reveals piles of bones, mostly concentrated near the door. The bones appear to be from merfolk and show signs of gnawing. An aquarium with dark water is found at the back of the room. A tentacle grabs a bone when it is dipped into the water. The team moves to another room with a shattered aquarium and finds a treasure chest and a small castle inside. They discover torches that activate mechanisms when placed correctly. In another room, a locked door is hammered open, causing a flood of water to gush out. The room is filled with rotting body parts and large crabs. The team communicates with Atchi, who shares a message about respecting life. The crabs approach but are temporarily intimidated by sound waves. One crab has a key attached to its shell. The team tries to maneuver around the crabs.