Flooded Basement

Flooded Basement is an area in B3313.

Description
This area is an exact copy of the vanilla basement, but filled with water and dark fog. Most doors in the area are removed to allow Mario to swim through the doorways, while other doors and holes like the 1st floor, Hazy Maze room, and Bowser in the Fire Sea are bricked off. None of the paintings in this area work, and there's no music. The only thing you can do here is drown.

Origins
The area is a recreation of the Flooded Basement from the video "Promo show" in Greenio's Super Mario 64: CLASSIFIED series. However, there are no coins unlike the source material.

Leading here

 * Nebula Lobby: Swim into the large black hole under the Peach painting.
 * Vanilla Basement: Enter the hole originally leading to Bowser in the Fire Sea.
 * Floor 3B: In the Door Room side of the moat, swim into the tunnel in the moat, then go right at the junction and into a hole at the end of the tunnel.