An insanely dangerous accident involving an unmanned motor boat was caught on video. The Martin County Sheriff’s Office in Florida says three men doing a photo shoot on the 24-foot vessel on the St. Lucie River somehow fell overboard. The boat then sped around in circles, forcing the men to repeatedly dive underwater so they could wouldn't be run over. At some point, the boat changed direction, slammed into a concrete dock, went airborne, and then hit another dock before finally stopping. The boaters managed to swim to a sailboat; only one suffered minor injuries.