I hope the OP doesn't mind me passing on this fascinating story....that it's not too far off topic.
Ballard wanted to find the wreck of the Titanic; as an oceanographer and geologist, he said it was his Mt. Everest.
He was formerly a commander in the US Navy, and he approached the Admiral about the idea of locating the Titanic...hoping the Navy would fund an expedition.
Ballard had technology that the Navy hadn't; the Navy used sonar- which can't distinguish between objects, and Ballard's camera (called Argo) could.
The Admiral wasn't interested in the Titanic, but did want Ballard to do something for the Navy, and that was to explore the wrecks of two Nuclear Subs- the Thresher and the Scorpion.
So, Ballard made a deal with the Admiral; he would go on what was this top secret mission to those two wrecks, and his expedition to locate the Titanic would be the cover story!
The Navy had already investigated these wrecks, but had been limited in their technology.
They knew what happened to Thresher, and it's a very tragic story. In 1963, 129 lives were lost when it imploded after reaching it's "crush depth". There had been a leak discovered in the engine room which couldn't be stopped and it worsened and eventually caused a loss of power and battery power wasn't enough to sustain it and it fell to a fetal depth
The Navy wanted to visit the site to be sure that no one had been poking around. The Admiral said " The ocean is littered with interesting intelligence, I can tell you."
Ballard was to locate the nuclear thing (sorry) to see that it was there and that it wasn't a harm to the environment. (He did, and it wasn't.)
The Navy wasn't sure about the Scorpion (1968)...they only knew that it had imploded after dropping below it's crush depth. There was speculation by some that it was torpedoed, or that it's own torpedo had malfunctioned and activated. (There's a term for that I don't remember.)
Ballard's examination of the site revealed that neither of those things occurred, so it's still a mystery as to why the sub went below crush depth.
99 lives were lost.
When Ballard was searching for these wrecks, he first came across the debris fields.
That information gave him the idea that instead of looking for the Titanic, "look for it's trail", which he knew would be to the south of the wreck because of the current.
He mapped out an area of 30 square miles and made sweeps a mile apart.
What had taken others months... and they never did find it, took Ballard only nine days.
Of course, he was elated because he'd found the wreck- but he was also very much relieved because he was afforded only fourteen days in which to do it!
I should add that this info came from a program called "Titanic: Ballard's Secret Mission". It was on very recently...National Geographic Channel.
Edited by regi, 21 November 2012 - 02:46 PM.