The search to turn back time on carbon emissions and find a reliable alternative energy source continues, but with the recent arrival of the Orbital O2 in the Orkney Waters, the answers may just lie in the currents. The Orbital Marine Power’s O2 is the world’s most powerful tidal turbine while having the visual appearance of a deep sea explorer. The hull is an astonishing 74 meters long, roughly the size of a Boeing 747, with retractable wings and massive props at the end of each. Each prop has two 10m blades pulling 600m² of flowing tidal energy in comparison to the large windmills we see scattered across the plains with 37m long blades. And to keep things in check and as not to be swept away by the currents it intends to harness power from, the O2 is anchored by a four-point chain system that has the strength equivalency of lifting 50 double decker buses.