Trivia: The opening shot of the film is the most expensive shot ever produced using CGI, costing at around $2.5million.
Trivia: The UK poster of the ship underwater isn't actually the Poseidon. It's actually the P&O Cruises Arcadia II. This is because they hadn't designed the Poseidon when the poster was released.
Trivia: Some reviews address the presence of a life raft with a flare gun inside. Life rafts are stored in containers which are lashed to deck with a hydrostatic release unit (HRU). Such a unit contains a weak link and a blade; the latter cuts the weak link at sufficient hydrostatic pressure when a ship sinks (or capsizes). The container is then free to float to the surface; a painter line, attached to the ship will activate and inflate the raft. A flare gun is inside as part of an emergency pack.
Trivia: During the filming of the scene where Robert drowns, Kurt Russell really started drowning.
Answer: According to him, yes: https://www.thefreelibrary.com/BOX+office%3A+Making+drowning+an+art+form%3B+Kurt+Russell+tells+Robin...-a0146253600.