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On Sunday, the researchers started by launching a drone from the pitching deck of their boat to get a bird’s-eye view of the large, dark shapes meandering lazily through the surf zone.

The search continued on Thursday as National Sea Rescue Institute spokesman Craig Lambinon said strong rip currents could have swept Narjissi into the surf zone and out to sea.

It’s important to know what rip currents are and how to look for them, because they are a leading cause of drownings in the surf zone near shore.

Rip currents are narrow currents in the surf zone that move quickly away from shore.

Seven of the top 10 beaches that experience the highest number of surf zone fatalities, shark attacks and hurricanes are in the Sunshine State, according to a report by the news site Travel Lens.