Pirates, Barnacles, Marine Biology, Porn.
Intelligent Marine life, a skilled salvage crew, cool people with tattoos.
Sea Chanties, Whale Songs, Gordon Lightfoot, Sirens, The "ping" noise that submarines make.
The Deep, The Abyss, The Poseidon Adventure, Gray Lady Down, Das Boot, Ghost Ship, Speed 2.
Raise the Titanic, The Perfect Storm, Terror at Sea.