A pod of Florida dolphins that were trapped in a canal in St. Petersburg were rescued by volunteers who formed a human chain to help free them.

A group of four dolphins that were stranded in a canal near the Fossil Park neighborhood since Sunday was rescued on Tuesday, CNN reports.

"The dolphins were interested; they actually came over right away, and kind of investigated," said Andy Garrett, a biologist with the Florida Fish Wildlife Conservation Commission.

Dolphins use echolocation to travel through the water, and experts believe that the height and sound of the nearby bridge were an obstacle. Dolphins send out high-frequency sounds, that bounce off of objects in order to navigate in the water.

When FWC were first made aware they waited to see if the dolphins would be able to swim with the tide. A day later when it became apparent that the dolphins were in distress, FWC officials created a plan to help free them. With the help of sounds, vibrations, and a human chain, the dolphins were able to swim to freedom.

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This story has been written and syndicated across GateHouse Media Group's 22 Florida markets.