Escape from the Tea Cup!
From the Super Mario Wiki
Escape from the Tea Cup! is the first story of an additional chapter three in the game Wario Land II. It is set in the SS Tea Cup after the ship has been demolished by Wario and sunk to the bottom of the sea.
The level is very similar to Stage 2-4, since it features many of the rooms that were found in the previous level. The main difference is the presence of the water that entered the ship when it sunk, changing how the area is traversed.
* - Only appears in Game Boy version.
Hidden Treasure: Pearl Idol
The hidden treasure of this level, the Pearl Idol, is located in the very same place as it was in the previous level: in the room where the cracked pillar was. It is the room to the far right in the flooded corridor. The room is now partly flooded with sawfish and crates that float on the water. The treasure door isn't accessible like it was before, the player has to take a detour to reach it. In the water they should head left and, instead of entering the room with the bubbles, climb the ladder to the left. At the top they should turn right and look for the treasure door.
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