The camera footage is probably better than whatever you could see through a few inches of porthole
Yes that was the intent with my comment. A specialized camera for that depth is going to capture better images than what you'll see thru whatever "window" is on the sub.
I was talking about the movie Titanic…
I think they mean footage of the Titanic.
There is a whole movie with footage filmed by James Cameron over a dozen dives. It won an Academy Award…