Eyewitness video captured the frenzied moments after a Georgia ferry dock walkway collapsed Saturday, killing seven people. The video, published Monday by The Associated Press, shows people clinging to the broken walkway to keep themselves out of the water.

Investigators have begun looking for reasons behind the failure at a ferry dock on Sapelo Island, the site of a festival celebrating the heritage of descendants of enslaved people.

Georgia authorities say they are investigating the “catastrophic failure” of a dock gangway that collapsed, killing seven on Sapelo Island.