Sunken Ghost Ship

The Sunken Ghost Ship is in Super Mario World that serves as a gate to the Valley of Bowser. After defeating Wendy O. Koopa, Mario has to swim through this ship in order to make the doorway to World 7 come out of the sea. On board the ship are some Bullet Bills, Mines, Koopas, and a massive swarm of Disappearing Boo Buddies.

Trivia

 * The Super Mario World manual mentions that the Sunken Ghost Ship may have once been one of the Airships utilized by the Koopalings in Super Mario Bros. 3.
 * Unlike most levels in Super Mario World this level doesn't have a Goal Post. The only way to trigger the exit and open the Valley of Bowser is to find Green ? ball.