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In page Aquaman (TV pilot):

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Some of the actors received training from Staff Sergeant Leo Castellano on the proper way to present arms.[2] Much of the filming took place underwater; Hartley filmed his underwater scenes without a tank, breathing from the safety divers' tanks around him for the scenes out on the ocean.[3] Hartley had never been scuba diving and was not a diver, but did say that he was a good swimmer.[3] Entity FX, the firm which did the special effects for Smallville since its second season, was contracted to work on the Aquaman pilot.[4]