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The Underwater Entrance is a location in the Lake Kingdom in Super Mario Odyssey. Its Checkpoint Flag is placed at the start of the open lake section, at the end of the tunnel divided into sections referred to as the Spiky Passage and Spiky Waterway. The Checkpoint Flag is below openings in the wall, one of which holds a Power Moon. The tunnel itself is accessed by using the Zipper in front of the Odyssey to pull away the gate, revealing the beginning of the passage. As it suggests, the floor is covered in spikes, with a spout in the middle providing Bubbles for more air. There is a seed here Mario may take to the pot on the first floor of the Water Plaza to grow a Power Moon. Later on, in the waterway, Mario must take the path on the left to head out of the tunnel, or head right to a hidden treasure chest containing a Power Moon. On the way out, Mario may run into Komboos he can defeat.