The greenWAVE, as the device has been called by Oceanlinx, is a little different to the Oyster designs being tested in Scotland. Weighing in at over 3,000 tonnes it just sits on the ocean floor without the need of anchoring or mooring lines to secure it in place. In about 15 metres of water the device is partly submerged. An opening below allows water to enter into the unit as a wave hits, this pushes a column of air up through a turbine, generating energy. As the wave moves on and the water recedes again, the air flow reverses, turning the turbine in the opposite direction and generating more power.