WATER1 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 for the top and a normal appearance when submerged, as opposed to both sides like WATER2. Unlike CURRENT, there is no Water current; this mechanic was too buggy (due to a Wind Tunnel sound) according to Dave Weiden to be included.
Walkthrough
Walk forward to drop into the Water.
Gallery
WATER1