The Limiting Factor submarine fills her ballast tanks and prepares to dive to full ocean depth. (Photographer: Reeve Jolliffe/EYOS Expeditions)
(Bloomberg Businessweek) -- For some, the ultimate adventure is up in the stars. (See: Musk, Branson, Bezos.) For Texas businessman Victor Vescovo, the trip of a lifetime is a dive to the deepest known point on our own planet, the bottom of the Marianas Trench.