<P> Parts of the third film were shot during location filming of Pirates of the Caribbean: Dead Man's Chest, a long shoot which finished on March 1, 2006 . During August 2005, the Singapore sequence was shot . The set was built on Stage 12 of the Universal Studios backlot, and comprised 40 structures within an 80 by 130 - foot (24 by 40 - m) tank that was 3 ⁄ feet (1.1 m) deep . As 18th century Singapore is not a well - documented era, the filmmakers chose to use an Expressionist style based on Chinese and Malaysian cities of the same period . The design of the city was also intended by Verbinski to parody spa culture, with fungi growing throughout the set . Continuing this natural feel, the floorboards of Sao Feng's bathhouse had to be cut by hand, and real humidity was created by the combination of gallons of water and the lighting equipment on the set . </P> <P> 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 . </P> <P> Filming finished on December 12, 2006 in Molokai, and the first assembly cut was three hours . Twenty minutes were removed, not including end credits, though producer Jerry Bruckheimer maintained that the long running time was needed to make the final battle work in terms of build - up . </P> <P> Hans Zimmer composed the score, as he did for the previous films, composing eight new motifs, including a new love theme for the At World's End soundtrack . He scored scenes as the editors began work, so as to influence their choice of cutting to the music . Gore Verbinski helped on the score . He played the Ennio Morricone - influenced guitar music in the parley scene between Barbossa, Sparrow, Elizabeth and Will, Davy Jones, and Cutler Beckett . He also co-wrote the song "Hoist the Colours" with Zimmer . </P>

How long is pirates of the carribean at worlds end
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