A joyous fall celebration on Sapelo Island turned tragic when a dock gangway collapsed, plunging dozens of people into the water and resulting in seven fatalities. The incident occurred on Saturday during a gathering of the island’s Gullah-Geechee community, descendants of enslaved Africans. Authorities are investigating the “catastrophic failure” of the aluminum gangway, which was installed in 2021. It’s estimated that over 40 people were on the gangway when it collapsed, with at least 20 falling into the water. READ: 4-Year-Old Child From Lee Killed In Rollover Crash On Florida Highway “It i…