Dire, Dire Docks
Dire, Dire Docks is the second water-themed level in Super Mario 64 and Super Mario 64 DS. Dire, Dire Docks is the ninth course of both games. Much like Jolly Roger Bay, Dire Dire Docks has a large body of water and marine life throughout the level. The starting area is a deep lake with a whirlpool at the center (which can suck Mario in) and an underwater tunnel that connects to a cave where Bowser's Sub is docked.
Dire Dire Docks doesn't have a painting, instead it's a vertical wall to wall rippling blue portal. It can be located in the basement, near the door to the area with MIPS. Mario will need 30 Power Stars before he can enter it.
A large door with a star on it can be seen in the basement, the portal is here in a hallway. When Mario completes the Board Bowser's Sub level, the portal will move backwards, revealing a hole in the ground that leads to Bowser in the Fire Sea. When Bowser is defeated, the sub will be gone, and a passage will open, making a warp outside Peach's Castle.
There are a total of 106 coins in the level, so getting the 100 coin star can be very hard. Only 6 coins can be passed up, so collect every single one the player came across.