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Cameron's insecurities really shine through in that interview.

Basically: how thorough can their investigation be if they haven't spoken to me? me! and hey, I'm an insider, because, because someone told me classified information! and here's the timestamp to help narrow it down!.

Accident investigations are very tight-lipped matters.  By procedure.  But, people get frustrated about the lack of communication/information (but undocumented chatter introduces biases that can wrongly influence an investigation), and antsy people are easy targets for 60 Minutes. It's 60 Minutes' business model.

Investigations will typically take a year.  I would expect this to take longer.

Last year, a purported transcript of communications between the Titan submersible and its mother ship circulated widely on the internet. Viewed millions of times, the so-called log suggested that a series of alarms had turned a dive to the resting place of the Titanic into a heart-pounding crisis in which the five voyagers struggled in vain to return to the surface.

But the head of the U.S. federal government team investigating the disaster said the entire transcript is a fiction. After nearly a year of investigation, his group has found no signs that the five voyagers aboard the Titan had any warning of the catastrophic implosion that was to take their lives. Two miles down, where seawater exerts vast pressures, an implosion would have made the violent collapse of the vehicle’s hull instantaneous.

“I’m confident it’s a false transcript,” said Capt. Jason D. Neubauer, who retired from the U.S. Coast Guard and serves as chair of the Marine Board of Investigation, the agency’s highest level of inquiry. “It was made up.” Its authorship is not known.

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Despite the log’s air of authenticity, the federal team saw through the pretense for a variety of reasons. Significantly, Neubauer’s team gained access to the records of the actual communications between the submersible and its mother ship, which remain an undisclosed part of the federal investigation.

He said that his team, aided by investigators from the National Transportation Safety Board, had “found no evidence” that Titan’s voyagers had any awareness of the imminent implosion or their fate.

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But I bet it (a movie) is in the works.

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That makes sense. Fatigue should have been factored into the process. That's just bad planning.

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When you make a hull that might withstand the pressure...
DON'T DRILL A FUCKING HOLE IN IT !!

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As far as I know, Cameron isn't an engineer, so I take his technical assessments with the expectation that someone told him that information, not that he knows it firsthand.  At least he's smart enough to hire actual engineers in the naval architecture field to do his design work.

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And making it thick-walled just made it much worse - I'd be curious to know if they took that into account; I can't imagine that the fabricator didn't understand the implications of going with a thicker wall.