Question: where was pirates of the caribbean 3 filmed

title: Pirates of the Caribbean: At World's End
text: Filming resumed on August 3 , 2006 at the Bonneville Salt Flats in Utah for 70 days off the California coast , as all the shooting required in the Caribbean had been conducted in 2005 . Davy Jones 's Locker was shot at Utah , and it was shot in a monochromatic way to represent its different feeling from the usual colorful environment of a pirate . The climactic battle was shot in a former air hangar at Palmdale , California , where the cast had to wear wetsuits underneath their costumes on angle - tipped ships . The water - drenched set was kept in freezing temperatures , to make sure bacteria did not come inside and infect the crew . A second unit shot at Niagara Falls . Industrial Light & Magic did 750 effects shots , while Digital Domain also took on 300 . They spent just five months finishing the special effects . The film posed numerous challenges in creating water - based effects .