SAVANNAH, Ga. — A survivor of Sapelo Island dock gangway collapse reunited with one of her rescuers. Bertha McKnight, 80, and college student Catherine Sneed were both on the dock when the gangway suddenly gave out. The collapse sent 20 people into the water, including McKnight. Seven people died.

A ferry connecting an island off the coast of Georgia resumed operations Monday while the investigation to see what might have caused a deadly dock collapse that killed seven people continues.

Georgia authorities said Sunday they are investigating the “catastrophic failure” of a dock gangway that collapsed and killed seven people on an island off the state’s Atlantic seacoast, where crowds gathered for a celebration by the island’s tiny Gullah-Geechee community of Black slave descendants.