The Titanic model used for filming was on display at Anchor Bay, Malta, in a building close to the set used for the town of Sweethaven in the film Popeye. Later, it was moved next to the deep water tank at the Rinella studios in Malta. A storm hit the island in 2003, damaging the model beyond repair.
Clive Cussler hated this movie so much that he refused to allow the sale of any film rights for his other Dirk Pitt novels. He finally relented 20 years later, and agreed to sell the rights to 3 novels. The first to be filmed was Sahara, which Cussler also hated.
M. Emmet Walsh's character was originally Al Giordino, Dirk Pitt's literary sidekick. He was called Giordino in some early publicity materials. He was also killed off towards the end of at least one early draft of the script.
When the camera pans across the Titanic just after it surfaces, look for a very tiny bit of movement in the lower part of the picture, about midway along the hull. As a gag, the special effects crew created a tiny prop of two figures working a hand pump.