From the Super Mario Wiki
Deepsea Ruins, or Soda Jungle-5 is the fifth course of Soda Jungle in New Super Mario Bros. U, located in the haunted sub-area of Soda Jungle. It takes place in a presumably steaming lake. This level uses the volcano underground music theme from New Super Mario Bros. Wii.
Similar to Stone-Eye Zone, the most prominent platforms are Stone-Eyes that have various behaviors, though they are completely immobile in the forest lake. The lake is also inhabited by Fish Bones and Circling Boo Buddies.
The second part of the course takes place in a dark underwater cave. There are many Jellybeams and Bonefishes, as well as tumbling Stone-Eyes. The last area inside the cave contains Bulbers and more Circling Boo Buddies. In the Goal Pole area, Mario can jump on a group of rising Stone-Eyes to reach the Flagpole.
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