Wario Land 3: Part 66: The Steep Canyon (Green Chest)

Use Wario's improved swimming capabilities from the Frog Prince's Glove to swim through the level's bottom water current. First, reach the new doorway in the middle of the first room. Then swim through the next room's current, past a goal, and into a warp pipe. Climb up a tall green room, return outdoors, and use an owl to fly against floating spiked balls toward the green key. Finally, return to the tall green room to find the green chest, which contains a telephone that Wario can use to make calls.