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From land, a rip current can appear relatively calm, as a strip of water that extends out between breaking waves. Its appearance can be deceiving.

Rip currents can last anywhere from five seconds to five minutes. Gill said to look for those red flags that signal high water hazards, and always swim in front of a lifeguard.

Rip currents are powerful and fast-moving channels of water that flow away from the shore and out to the ocean. They catch people by surprise and are strong enough to overpower the strongest swimmers.

Malcolm-Jamal Warner, the actor who played Theo Huxtable on The Cosby Show, has drowned on Costa Rica's Caribbean coast.

io9 RIP Ozzy Osbourne, Music Legend and Master of the Macabre The influential heavy metal icon passed away today, just weeks after Black Sabbath's farewell show July 5.

The beach in Costa Rica where Malcolm-Jamal Warner drowned was known for its strong surf and dangerous rip currents, and was not protected by lifeguards when he died on Sunday.

Officials say the pair were wading in the lake around 11:30 a.m. Sunday when they stepped into a rip current channel at Washington Park Beach. They were pulled far away from shore into deeper water.

Tips on how to escape a rip current in Lake Michigan, and how to help a struggling swimmer without putting yourself at risk.

Dangerous currents are common in the Great Lakes, especially in Lake Michigan, where rip currents are especially dangerous and can cause drownings.

Rip currents can sweep away even the strongest swimmers. Rescues can quickly turn to tragedy when a rescuer gets caught in the current.