Ocean power in New Zealand speed. Because the tidal speed doubles, eight times more tidal power can be produced at spring tides than at neap tides. The entrance to Kaipara Harbour, one of the largest harbours in the world, is a channel to the Tasman Sea. It narrows to a width of , and is over deep in parts. On average, Kaipara tides rise and fall . At high tide, nearly 1000 square kilometres are flooded. Spring tidal flows reach 9 km/h (5 knots) in the entrance channel and move 1,990 million cubic metres per tidal movement or 7,960 million cubic meters daily. In 2011,
Poland's Wedding to the Sea Poland's Wedding to the Sea Poland's Wedding to the Sea was a ceremony meant to symbolize restored Polish access to the Baltic Sea that was lost in 1793 by the Partitions of Poland. It was first performed on February 10, 1920, by General Józef Haller at Puck (Putzig). In the early spring of 1945, following the Polish-Soviet advance into Pomerania, a number of such ceremonies took place in several locations. The most famous 1945 Weddings to the Sea were performed by the soldiers of the Polish Army on March 17, 1945 in Mrzeżyno (Regamünde), and on March 18 in newly