The Underwater Drone is an enemy featured in Duke Nukem: Total Meltdown exclusively in the Plug 'N' Pray episode's Trackside Tragedy level. They are found in underwater areas. Their attack is the same as the Sentry Drone, they will try to kill Duke by ramming into him and exploding in the process. Their appearance is decidedly different from the sentry drones, though, with an artificial sharkskin built around the chassis, complete with a dorsal fin, and impeller jets on the back instead of anti-grav units, to allow them to maneuver around underwater. The Underwater Drone also makes an appearance in Duke Nukem: Zero Hour. In it is a red color and will home in on Duke, firing torpedoes.