This unusual underwater journey in South Africa involves kayaking legend, French expat, and mad inventor Olivier Feuillette, and a modified kayak. With a waterproof top, a ballast (so that it will sink), scuba tanks for oxygen, a CO2 filter, an oscillating fishtail, and pedals, Feuillette’s SUBO becomes a one-person submarine that’s ready to go where no kayak has gone before.