Through the Jet Stream (Jolly Roger Bay)
From the Super Mario Wiki
Through the Jet Stream is the sixth mission of Jolly Roger Bay in Super Mario 64 and its seventh mission in Super Mario 64 DS. The mission's goal is to collect a Power Star inside a jet stream. This mission cannot be completed until the Power Star of the first mission, Plunder in the Sunken Ship, is collected, as the sunken ship blocks the hole releasing the jet stream. It is the only mission in the games to share its name with another mission in the same game.
The Power Star is found at the bottom of a jet stream, which is located at the bottom of the bay. The stream is covered by a grate, which lets the pressure pass through but prevents the player from entering. In Super Mario 64, Mario can only obtain the Power Star if he becomes Metal Mario. There are two Metal Caps in the level: one on a platform close to the ship and one inside the cave where Treasure in the Ocean Cave takes place. As Metal Mario sinks to the bottom of water, he is unaffected by the jet stream and can collect the Power Star. In Super Mario 64 DS, the star is only obtainable by Wario, as he is the only character that can use the metal ability. Otherwise, the mission is the same.
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