what is an undertow
An undertow is a type of ocean current that is caused by waves breaking on the shore.Most are quite mild and not dangerous, as long as swimmers keep their heads, although some have been known to be powerful enough to sweep swimmers out to sea.ndertows do not pull you under, sort of. An undertow is basically spinning you around like you're in a washing machine. The dangerous undertows form where there is a steep shore, sandy especially, and strong waves crash on it with frequent and relentless regularity.