CNN interview here.
Their submersible, designed by Graham Hawkes, is one of the more interesting parts of the journey. Shaped more like a dolphin than a traditional submarine, the Virgin Oceanic craft has an operating depth of 37,000 feet--about seven miles--which means it has to be able to withstand outrageous pressure, 1,500 times that of an airplane. Constructed of carbon fiber and titanium (with a quartz dome), the craft is currently undergoing tests--at that depth, the smallest crack would result in certain death for the pilots, both due to the immense pressure (13 million pounds) and the simple fact that there exist no other vehicles capable of a rescue mission. The sub travels at a maximum of three knots, and can dive at 350 feet per minute, so a dive to the bottom of the Mariana trench and back would take around five hours.
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