The underwater scenes were shot in a huge purpose-built tank with a bluescreen background. Safety divers swam in-between takes with scuba regulators, to allow the actors and actress to breathe without having to surface. Daniel Radcliffe alone logged around forty-one hours and thirty-eight minutes underwater during the course of filming. At one point, during training, he inadvertently signalled that he was drowning, sending the crew into a huge panic to bring him back up to surface.

Film

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