Image: Michel Griffon, Wikipedia Commons
Square waves indicate a phenomenon known as a “cross sea”. Spotted the warning signs? Be sure to take heed. For swimmers, surfers and even large ships, square waves indicate significant hazards that should not be underestimated.
Those hazards? Beneath the surface, there are strong undercurrents that can pull the unprepared down to the depths, with anyone caught often coming to an unfortunate end. Those in the water risk drowning, whilst vessels caught in a cross sea can be wrecked, regardless of their size.
Look out for the tell-tale signs that occur when two wave systems run into each other. This is a wind-generated phenomenon and those who do spot the square patterns on the ocean surface should take evasive action and head for calmer waters immediately.