USS Spiegel Grove

Image credit: Wikimedia Commons

Overview

The USS Spiegel Grove (LSD-32) is a massive 510-foot retired United States Navy dock landing ship that serves as a cornerstone of the Florida Keys artificial reef program. Located approximately six miles off the coast of Key Largo, the vessel was intentionally sunk in 2002 to create a new habitat for marine life and relieve diving pressure on the adjacent natural coral reefs.

The sinking of the Spiegel Grove is a notable piece of maritime history. The ship initially sank prematurely during the scuttling process and landed upside down, leaving a portion of her hull protruding above the surface. Following an extensive salvage operation, the ship was rolled onto her starboard side. Remarkably, three years later, the powerful storm surge from Hurricane Dennis in 2005 flipped the colossal wreck entirely upright, seating her perfectly on the sandy bottom. Today, the wreck sits within the protected boundaries of the Florida Keys National Marine Sanctuary (FKNMS), providing a world-class diving environment.

The Dive Experience

Due to the sheer size of the vessel and its depth profile, diving the Spiegel Grove is strictly recommended for advanced divers. The top of the superstructure, which includes the radar towers and upper decks, rests at a depth of approximately 18 meters (60 feet). However, the main deck is located at roughly 30 meters (100 feet), and the hull bottoms out in the sand at 40 meters (130 feet).

Divers must navigate mooring lines to descend to the wreck, as the site is frequently subject to moderate to strong ocean currents. For those looking for the best places to learn wreck diving techniques, the Spiegel Grove offers excellent exterior architecture for orientation. However, penetration into the interior corridors and rooms of the ship is extremely hazardous and should only be attempted by individuals holding specialized technical wreck or cave diving certifications. Even experienced divers should review their travel and packing checklist to ensure they have adequate redundant air sources and cutting tools before undertaking this dive. (This is not an appropriate site for those just finishing their open water course.)

What You’ll See

Since its sinking, the Spiegel Grove has been heavily colonized by a diverse array of marine life. The exterior steel hull and superstructure are encrusted with colorful sponges, tunicates, and various species of soft corals, effectively transforming the ship into a vibrant, living reef.

The massive structure acts as an immense fish aggregation device. Divers regularly encounter huge schools of horse-eye jacks and barracudas patrolling the upper decks and mooring lines. Dense clouds of silversides often congregate around the superstructure, moving in synchronized unison when approached by predators.

Perhaps the most sought-after encounter on the Spiegel Grove is with the Goliath groupers (Epinephelus itajara). These massive fish, which can reach lengths of over two meters and weigh hundreds of kilograms, frequently take up residence in the large cargo holds and open deck areas of the ship. They are particularly abundant during their late-summer spawning season, offering an awe-inspiring sight for divers observing from the exterior decks.

Planning Your Dive

Access to the Spiegel Grove is highly convenient, with dozens of dive charters operating daily out of marinas in Key Largo and Islamorada. Boat transit times typically range from 30 to 45 minutes. Water temperatures vary seasonally, dropping to around 22°C (72°F) in the winter months (January-February) and peaking at 30°C (86°F) in the late summer. A 3mm or 5mm wetsuit is generally sufficient, though a hood or vest may be required for deeper dives during the winter. All divers must adhere to sanctuary regulations, ensuring they do not disturb the wreck structure or the marine life inhabiting it.