Star Wars (1977)

Other mistake: When the stormtroopers break into the control room, the stormtrooper on the right of the screen hits his head on the door frame. On the DVD release they've added a thump when he hits it. (01:18:55)

Luke: How did my father die?
Obi-Wan: A young Jedi named Darth Vader, who was a pupil of mine until he turned to evil, helped the Empire hunt down and destroy the Jedi knights. He betrayed and murdered your father.

Trivia: When Alec Guinness was offered the part of Obi-Wan Kenobi he was offered about $25,000 to play the part. After reading the script he was one of the few cast members who believed that the film would be a box office hit; he negotiated a deal for 2% of the gross royalties paid to the director, George Lucas, who received one fifth of the box office takings. Guinness made over $3,000,000, making him very wealthy in his later life.

Question: During the trash compacter scene, Luke gets sucked under by the one-eyed monster thing, which leads to Han and Leia trying to find him. But if the water's only about knee deep, why is it so hard for him to be found?