Why can undercurrent be dangeroud?

Undercurrents can be dangerous because they create strong, often invisible currents beneath the surface of the water, which can pull swimmers or boats away from shore. These currents can be unpredictable and may exceed the strength of a swimmer, leading to exhaustion or drowning. Additionally, undercurrents can disorient individuals, making it difficult to swim back to safety. It is crucial for swimmers to be aware of local water conditions and to heed warnings about potential undercurrents.