Nature never ceases to amaze us with its incredible transformations. One of its most stunning wonders is the occurrence of cross seas or waves that form watery grids. These mesmerizing grids are created when two sets of wave systems blend at different angles greater than 45 degrees, or when the wind pushes waves in one direction and a swell pushes them in another.

While this phenomenon may appear beautiful to the eye, it can be extremely dangerous for both swimmers and ships. Hidden beneath the breathtaking sight are treacherous currents that can wreck ships and pose threats to people in the water. Navigating through the chessboard-like patterns of these cross seas proves to be an immense challenge. In fact, many boating accidents and shipwrecks have been attributed to this phenomenon.

According to the European Space Agency, these conditions are quite common in the ocean and often occur when a windsea and a swell, or two swell systems, coexist. A 2004 study found that a significant percentage of ship accidents took place in crossing sea states. This occurrence is particularly prevalent along the western coast of France, specifically at the Isle Rhe. Though it is extremely dangerous to enter the water during these events, tourists can still marvel at the water grids from the safety of a lighthouse located on the western part of the island.

To witness the incredible power of nature’s phenomenon, watch the video below.

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