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The 
 are from a company called Caladan Oceanic. Its 
 is Victor Vescovo, a 
 US Navy commander. He has a 
 for adventure and for visiting some of the world's hardest-to-get-to 
. He holds the 
 for being the first person ever to get to the top of all the world's 
, both poles, and the bottom of all the world's 
. Mr Vescovo said the 
 to film the USS Johnston was a personal one because that ship and his submersible were made in the same shipyard and both served in the US Navy. He said: "As a US Navy officer, I'm proud to have helped bring clarity and 
 to the Johnston, its crew, and the families of those who died on it."