WATER2 is a Single Player level. There is no in-game name for this level, nor is there any name included with the documentation. The level therefore is named after the filename.
While intended to include an ambient sound for the Water, Dave Weiden couldn't get the sound to loop.
This level is designed to showcase animated, flowing Water. This version features an animated surface on both sides, as opposed to one side like in WATER1 and CURRENT.
Walkthrough
Walk forward to drop into the Water.
Gallery
WATER2