Often inaccurately called riptides, rip currents are formed when ocean waves get forced between obstacles — like coral reefs, sandbars, piers, or rocks — on their way back out to sea. As the returning waves are squeezed in, they start to move faster and swirl around, carrying you away from shore and into deeper water. Use the above guide to learn to stay calm and escape so your day at the beach doesn't end in tragedy.