The billionaires are bankrolling expeditions to reach the deepest place in the ocean, a spot called the Challenger Deep that lies at the bottomof the Mariana Trench, seven miles below the surface of the South Pacific.
After the first solo pilot tests the sub, Mr. Branson himself will pilot it to the bottomof the Puerto Rico Trench, near his private island of Necker in the British Virgin Islands.
Barely a month after filmmaker James Cameron piloted a newfangled submersible to the bottomof the Mariana Trench, audiences can get an inside look at the historic expedition that for the first time sent a lone human to the deepest place on Earth.
It's up for grabs, who will be first to descend to the bottomof the legendary Mariana Trench and back, in roughly the time it takes to drive from San Francisco to Los Angeles.