When a cruiser or an ocean liner is torpedoed at sea, it's rare to find a movie camera posted to film the disaster; so the movies do their own torpedoing. A European government sponsored a war film for which a huge model of an ocean liner was built just to be blown up. It was constructed in two parts; first the lower hull, in which explosive was planted for the fake torpedoing, then the superstructure, done in great detail. The hull was set afloat from a seashore, the upper section was added, then as cameras ground the ship was lown up with extreme realism.