Trivia: Pneumatic palm sanders were used as hatch door switches for the gravity drive room and the access-way leading to it. Do a Google image search for "Pneumatic Palm Sander" to see examples of the tool. It's a vintage or classic style that's used in the film. (00:26:45)
Trivia: The Event Horizon was designed to have features subtly reminiscent of the famous Notre-Dame Cathedral.