Diving at Spiegel Grove (United States)

The colossal structure of the Spiegel Grove, a formidable 510-foot (155 m) former Navy landing ship, now dominates the seafloor off Key Largo. This monumental vessel, larger than any natural reef in the Keys, embarked on an unusual journey to become an artificial reef.

Initially scuttled in 2002, it unexpectedly landed on its starboard side, presenting a challenging orientation for divers.

However, nature intervened when Hurricane Dennis, three years later, righted the ship, settling it upright in its current impressive position. Now, this vast artificial habitat, towering from the sandy bottom at approximately 43 m (140 ft) to its shallowest points at roughly 21 m (70 ft), hosts an entire, evolving ecosystem.

Exploring its immense dimensions often requires multiple dives or the use of a diver propulsion vehicle (DPV) to truly appreciate its full length and complex internal structure. Multiple mooring buoys ring the site, offering secure tie-off points for dive vessels and helping to preserve this impressive wreck.

Divers can navigate the expansive superstructure, peer into its open cargo holds, and trace the vast corridors that once housed troops and equipment during the Cold War. Even on days with excellent visibility, the sheer scale of the Spiegel Grove demands thoughtful dive planning, encouraging exploration of different sections on subsequent descents to fully absorb its character. Its presence fundamentally reshapes the underwater landscape, providing a dynamic experience that reveals new aspects with each visit.