ST. PETERSBURG, FL (CNN) -- Two people are okay after falling off a boat in the waters near theSt. Petersburg Pier on Monday.

The unmanned boat went in circles for at least a half hour. Crews let the boat run out of fuel before stopping it.

One of the men on board said he and a friend were trying to catch sharks about two miles from shore when they hit a wake and got thrown off the boat.

He said they swam for their lives to avoid getting hit by the fast-moving boat or bitten by the very sharks they were trying to catch by throwing chum in the water.

A passerby rescued one of them.

The state fish and wildlife conservation commission says the incident was caused by operator inexperience.

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