Claustromania by Ragmens on November 6, 2001
This is a fast-paced Siege map that takes place entirely within a single large base. The attackers start on the bottom level, and the defenders are upstairs. There are 4 generators which power energy beams which guard the switch. All 4 generators must be taken out before the switch is accessible.
Here's the catch: the generators automatically begin to repair themselves after they've been disabled for more than 10 seconds. This means you'll need teamwork to capture the base.