EXCLUSIVESubmergin' Atlantic Plane sailing ... Branson's submersible 'plane' ADVENTURER Sir Richard Branson has unveiled his new toy - an underwater "plane" for a voyage to the bottom of the sea. The Virgin Atlantic boss hopes the submarine with fighter jet technology will explore unchartered depths at 35,000ft Deep pockets ... Branson's sub is set to explore at the very bottom of the sea The £415,000 carbon fibre prototype Necker Nymph will swoop 130ft under the surface but Sir Richard, 59, is building a stronger version to go deeper than any sub has ever been. Branson ... plans sea...