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underwater view of a swimming pool

During WWII, Concrete “Jacks” were placed along Miami’s beach to prevent enemy ships from landing an invasion along South Florida’s Coast. Following the War, these defenses were pushed into the sea, creating an accidental artificial reef which continues to attract fish and coral nearly 70 years later. The Jacks form a nearly continuous line perpendicular to the shore to approximately 50′ depth a mile or so off-shore. Access to the site is along the beach in John U Lloyd State Park. It is a moderate walk along the beach but the effort is well rewarded!


  • Type: Artificial Reef / shore dive
  • Min. Depth: 10 ft. / 3m
  • Max. Depth: 20 ft. / 6m
  • Skill Level: Open Water Diver
  • Location: (See Map Below)