The Gondola - from The QuakeLab is a Single Player and Multiplayer level. There is no in-game name for this level, the name comes from documentation included with the file.
Walkthrough
Proceed forward to head off a platform onto the roof of a gondola. Drop through one of the holes in the ceiling to land inside the gondola. Shoot the Button straight ahead, on the rock wall, to cause the Gondola to begin moving back and forth on its track. If you fall into the Water below by stepping through the hole in the middle of the gondola, you can return by using a Teleporter up a ramp to your far left.
Gallery
The Gondola - from The QuakeLab