Rip currents are responsible for about 150 deaths every year in the United States. In Florida, they kill more people annually than thunderstorms, hurricanes and tornadoes combined. They are the number-one concern for beach lifeguards: About 80 percent of all beach rescues are related to rip currents.

Despite these startling statistics, many swimmers don't know anything about rip currents, and they have no idea how to survive when caught in one. In this article, we'll find out what causes rip currents, how you can recognize them and what you should do if one takes you out to sea.