When the last firework goes off and the parks clear out for the evening, Disney's attraction machinists get to work. Between the dark, quiet hours of 11 p.m. and 7 a.m., they inspect each attraction to ensure everything is in tip-top shape. Certain scuba-certified machinists are responsible for the upkeep of Disney's water attractions, including the Jungle Cruise. On their dives, they'll check the ride tracks, the boats, and those lovable jungle critters for wear, debris, and any other issues that may arise. Working with (animatronic) gators and hippos is a tough job, but somebody's gotta do it.