If you see square waves forming in the ocean, get out of the water immediately
If you see square waves forming in the ocean, get out of the water immediately. These cross seas, or wave patterns that create grid-like formations, are truly captivating but pose a significant threat to swimmers and ships.
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, they hide dangerous currents that can destroy ships and endanger swimmers. The water with these unique patterns is extremely challenging to navigate, making it hazardous for boaters.
Scientists attribute many boating accidents and shipwrecks to cross seas. In 2010, the European Space Agency noted that these conditions frequently occur 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 phenomenon is often seen along the west coast of France, particularly at Isle de Ré. Tourists can safely 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.
