When two sets of wave systems blend at angles greater than 45 degrees, or when the wind and swell push waves in different directions, these grids are formed. Despite their visual appeal, these grids pose a significant threat to swimmers and ships.The stunning view hides dangerous currents that can destroy ships and endanger swimmers. The water with these unique patterns is extremely challenging to navigate, making it a hazard for boaters. Scientists attribute many boating accidents and shipwrecks to cross seas.In 2010, the European Space Agency stated that these conditions are frequently found in the ocean when a windsea and a swell, or two swell systems, exist together.In 2010, the European Space Agency stated that these conditions are frequently found in the ocean when a windsea and a swell, or two swell systems, exist together.A 2004 study indicated that many ship accidents happened while crossing sea states.This event is frequently seen along the west coast of France, specifically at Isle Rhe. Tourists are able to observe the water currents from a lighthouse on the island’s western side, as it is too risky to go into the water during this time.