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The creators say it gives scuba and free-divers a new way to explore freestyle underwater acrobatics as well as simply fly around underwater. The X2 is a unique arm-worn delivery system that generates powerful vectored thrust and are secured to the user's arms. It gives scuba and free-divers a new way to explore freestyle underwater acrobatics as well as simply fly around underwater. It is the brainchild of Portsmouth-based start-up S. P Marine Innovation and is powered by the latest lithium battery technology, coupled with state-of- the-art digital motors and a wireless control system.