The outdoor mock-up was basically a shell propelled with a small engine, and stationed in La Rochelle, France and has a history of its own. One morning the production crew walked out to where they kept it afloat and found it missing. Someone had forgotten to inform the crew that an American filmmaker had rented the mock-up for his own film shooting in the area. This filmmaker was Steven Spielberg and the film he was shooting was "Raiders of the Lost Ark". A few weeks later, during production, the mock-up cracked in a storm and sank, was recovered and patched to stand in for the final scenes. The full-sized mock-up was used during the Gibraltar surface scenes; the attacking aircraft (played by a North American T-6 Texan / Harvard) and rockets were real while the British ships were models.