What If You Were Caught in a Riptide?

Every year, beach lifeguards rescue tens of thousands of people. Four out of five times, it's from these rip currents, also called riptides. If you see the water do this, get out fast. If you don't, you might get caught in a riptide. What are the warning signs? Which direction should you swim if you want to survive? And what's pulmonary edema?
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