Through the Jet Stream (Dire, Dire Docks)
From the Super Mario Wiki
Through the Jet Stream is the fourth mission of Dire, Dire Docks in Super Mario 64 and Super Mario 64 DS. The mission requires the use of the Metal Cap in the original game or Wario's Power Flower ability in the DS version. It is the only mission in the games to share its name with another mission in the same game.
The player needs to first enter the second area of the course by going through the tunnel. On the floor is a steel grate with Bubble Rings flowing out of it. The player needs to swim through five of these rings before they disappear, otherwise missing one will start the counter over. Once five consecutive rings are swam through, the Power Star will appear above the grate. The player must then swim to the surface, collect the Metal Cap, and sink down to the waterbed in order to collect the Power Star, as the propulsion of the water will prevent the player from obtaining it normally.
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