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Facts 2025-06-30 13:43:23

Avoid Swimming If You Spot 'Square Waves'

To most beachgoers, waves are part of the fun and beauty of the ocean. But not all waves are harmless—especially when they form a rare and dangerous pattern known as “square waves.”

Though they may appear visually fascinating, square waves can be deadly. Experts warn swimmers and surfers to stay out of the water immediately if they spot this phenomenon.

What Are Square Waves?

Square waves, also known as cross seas, occur when two wave systems intersect at nearly perpendicular angles, forming a grid-like or checkerboard pattern on the ocean’s surface.

Unlike regular waves that move in a single direction, square waves result from two different weather systems or wind patterns clashing, creating conflicting currents beneath the surface.

Why Are They Dangerous?

While square waves might look calm on the surface, the currents below are highly unpredictable and extremely powerful. These opposing wave forces can create rip currents, vortexes, and powerful undercurrents that even experienced swimmers and lifeguards struggle to escape.

“Square waves are one of the most dangerous sea conditions,” says marine safety expert Dr. Lucas Meyer.
“They’re responsible for many drownings and boating accidents around the world.”

How to Recognize Square Waves

  • The water surface looks like a checkerboard, with waves moving at right angles to each other.

  • The wave pattern appears unusually geometric—a rare sight compared to typical ocean swells.

  • They’re often spotted after a storm, especially near coastlines where wave systems meet.

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