What is a strong current moving away from shore through a narrow opening called?

A strong current that moves away from the shore through a narrow opening is referred to as a rip tide. Rip tides occur when water that has been pushed towards the shore by waves finds its way back out to sea, often through channels in the sandbars that form along the beach. These currents can be quite powerful and can pose a hazard to swimmers and surfers who may be caught in them.

Understanding the nature of rip tides is crucial for divers and beachgoers alike as they can quickly pull swimmers away from the shore. Recognizing the characteristics of a rip tide, such as a channel of choppy water or a difference in water color, can help divers and swimmers avoid dangerous situations. Familiarity with rip tides is part of essential safety training in diving and marine environments.