In 1994, the United States sank 100 stripped M60 tanks in the Gulf of Mexico off Alabama, turning old armor into artificial reef structure that is still part of the state’s underwater landscape more than three decades later.
The tanks were lowered in stages under REEF-EX: the first six went down on June 1, another 58 followed in July 1994, and the final 36 were deployed in September. They were cleaned of weapons, fuel and hazardous materials before being placed in the Hugh Swingle and Don Kelley North artificial reef areas at depths of 70 to 110 feet.
The reason the tanks keep drawing interest now is simple. They are no longer military hardware in storage. They are habitat. Marine organisms colonize the exposed metal, and the state says the reef network off Alabama has helped support red snapper, greater amberjack, gray triggerfish and vermilion snapper while also creating fishing and scuba diving locations.
That is why the tanks mattered beyond the novelty of sinking armored vehicles at sea. Much of the seafloor off Alabama is flat sand or mud, which leaves little shelter for reef-dwelling animals. The tanks gave the bottom vertical structure through hulls, openings and raised surfaces, and that change spread outward into a larger web of life, from sponges and corals to crabs, worms, sea urchins and small fish that then draw larger predators.
The friction is in the timeline. The tanks were given a conservative expected reef life of around 50 years, yet they are already being described as still notable more than three decades after deployment. That does not answer how many of the 100 remain fully intact or still useful as reef structure, but it does show the project outlasted the short-term use many people would have expected from retired military equipment.
What comes next is less a deadline than a measure of endurance. The tanks remain part of Alabama’s artificial reef history, and the unanswered question is how much of that original 100 is still doing the work it was sunk to do in the Gulf of Mexico.
