Watching the film "The Silent Enemy" (about the famous Commander "Buster" Crabb) on TV recently, I noted that in a scene where he and his men dive on a crashed aircraft, it is clearly a wrecked RAF Neptune (although it is meant to be Gen Sikorski's Liberator which crashed at Gibraltar). The movie (released in 1958) was largely shot in Gibraltar and it also includes ramp shots of Shackletons of 224 Sq., although the action is set in WW2.
I wonder what Neptune was used in this film, as it would have to have been either put into a large water tank or sunk offshore for the scenes concerned. The full film is on Youtube and the Neptune is clearly recognisable at 1:09:40.