In 2023, Georgia sank two retired Atlanta commuter trains; seven months later, divers found corals, fish, and other marine life colonizing the railcars

Retired MARTA train cars were sunk off Georgia's coast to create new reefs. Divers found marine life and coral growth on the cars within seven months. These structures provide essential shelter for fish and endangered sea turtles. Other cities have also used subway cars to build artificial reefs. These reefs offer vital habitat where natural shelter is scarce.