不如睇吓當年佢點落去
https://www.wired.com/1998/02/cameron-3/
Lunch on the Deck of the Titanic
Before he shot Titanic, Jim Cameron needed to experience it himself. So he rented two Russian submersibles, built special cameras, and organized a 12,000-foot dive. He almost didn't come back. Excerpts from his private journal. Also: Contents Under Pressure Long before torn ticket stubs littered theater floors, when Titanic conjured historical tragedy, not Hollywood spectacle,
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It is safer to move in the direction you know the ship is not, then turn around, reacquire it on the sonar, and reapproach, rather than to drift in a random search. The Titanic is dangerous, possibly lethal, a fact easy to overlook from the toylike confines of the subs. Still, the Russians have nicknamed the camera system mounted on Mir 1 "the cannon" because they know that if the glass fails, the titanium shell is a piece of heavy artillery aimed right at the heart of their submarine. The 91/2-inch-diameter span of silica supports 1.1 million pounds of pressure. The merest wisp of a fracture would send an explosion of water back through the 2-foot titanium cylinder to the sub's outer shell at hypersonic speed.
Cameron's brother Mike, who designed the camera, has warned him repeatedly, "When you're maneuvering and you don't need to be filming, always keep the camera positioned transversely so if the end cap blows off, it just blows into the water." But in practice the lens is almost always aimed away from the sub, pointing at something. "Which means that the back of it is pointed at us. It is like walking around with a shotgun taped to your temple for about 16 hours, and just telling people, 'Don't touch the trigger!'"