Hi. Undercover Titanic expert here.
When the movie came out, I was 8 and most certainly NOT allowed to watch it thanks to the nudity and the fact they said the GD word.
So instead, I began reading books about it and now have a lot of suddenly relevant knowledge I've been saving for such a time as this.
The wreck was not discovered for 73 years, until 1985, not because we didn't know the general location of the wreck but because it is at a CRAZY depth beneath the surface. (About 2.5 miles, or over 12,000 ft down)
It's so deep most subs can't get down there. Navy recovery subs can go down 2000 feet for a comparison.
At that depth the waters are frigid, and the pressure is so dense no life could survive. Cuvier's beaked whales hold the record for survival depth and they can only live at 9,816 ft.
I cannot FATHOM getting in the remote controlled blimp these people got in to go down there. I hardly think it can even be labeled as a submarine. Now that we have all facts, that was an astoundingly risky mission and it would be a miracle if they were still alive. If they are somehow, the likelihood we can find them in time is slim to none.
We're not always as advanced as we think we are and the ocean is a powerful foe. I am struck by the fact that wealthy men died on the Titanic as it raced against technological development in 1912, and it seems these wealthy men have succumbed to the exact same fate 111 years later.
It's a tragic cautionary tale about the limitations of humanity and the need to maintain humility when we go up against nature.