Rivers and streams can appear calm on the surface but there may be: Strong undercurrents that can pull under even a strong and experienced swimmer.
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Britannica Dictionary definition of UNDERCURRENT. [count] 1. : a flow of water that moves below the surface of the ocean or a river. You could be pulled under water by the dangerous undercurrents.
Myth: Rip currents pull people under water. Fact: A rip current will not pull you under water, but they can pull a swimmer away from the beach beyond breaking waves. Myth: Human chains are an effective rescue technique. Fact: Human chains can be extremely dangerous.
You may have heard about the rip tide or undertow before. These are terms that people commonly use to describe dangerous currents. However, since there are no tides in the Great Lakes (needed to form a rip tide) and currents don't pull a person down under the water (undertow), they are a bit inaccurate.