LOWER KEYS DIVE SITES & KEY WEST

LOOE KEY REEF
Depth Range: 5-35 feet
Experience Level: Novice to
  Intermediate and Advanced
One of the loveliest and most prolific reefs in the Keys. The frigate, H.M.S. Looe, accidently ran hard aground in 1744; remains of the ship lie between two fingers of coral near the eastern end of the reef although only the ballast and anchor remain visible to the trained eye. Totally unlike any of the reefs in the Keys, containing a variety of corals, monastera, sea fans and innumerable fish species this makes for an exceptional diving experience. Looe Key is a designated marine sanctuary.
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ADOLPHUS BUSCH
Depth Range: maximum depth 110 feet
Experience Level:  Advanced
Located about 5 miles off shore of Cudjoe Key, it is 3 miles west of Looe Key.  The Adolphus Busch was cleaned and prepared for divers with large holes cut for nice swim through and was sunk December 1998 as an artificial reef.  There are three resident Jewfish living on the wreck and are seen on many dives.  The largest weights in at about 400 pounds.  The ship is 210 feet long and the maximum depth is 110 feet, a very good dive for nitrox.  This dive should be considered an advanced dive and divers wishing to dive the ship should have an Advanced Open Water certification or plan to be accompanied by an instructor or divemaster.
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CONTENT KEYS
Depth Range: 8-15 feet
Experience Level: Novice
Positioned on the Gulf side southwest of Marathon, this area is sheltered by the Keys and is a good alternative for shallow diving on a windy day. Rounded starlet corals grow here and numerous potholes and cracks in the coral rock make this an ideal home for both lobster and stone crab.
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SOUTH BEACH PATCHES
Depth Range: 15 feet
Experience Level: Novice to
  Intermediate
Scores of coral patches and reefs run along the southern shore of Key West. The most prominent ones are off the foot of Duval Street, Simonton Street, Casa Marina Hotel, Bertha Street, main bathing beach and off the airport. Almost any fish life that you might normally find on the outside reef can be found here.
*****
KEY WEST HARBOR
Depth Range: 30 feet
Experience Level: Advanced
Watch for heavy commercial boat traffic in this harbor which has been in use since the middle of the 16th century. At the north end of Simonton Street is a public boat ramp and dingly landing area that gives access to this advanced diving area. Interesting artifacts have been found in this location.
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SAND KEY
Depth Range: Awash to 3-65 feet
Experience Level: All Levels
Location: 24º27.19 81º52.58
Probably the most popular dive and snorkeling spots in the Lower Keys, it is a simple ground-up coral and small shell island without vegetation, topped by a red iron lighthouse bult in 1853 and now on the historical register. The reef itself consists mostly of rock fingers and gullies with sandy bottoms between cliff-like structures and extensive areas of staghorn and elkhorn coral.
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OUTSIDE REEFS
Depth Range: 40-210 feet
Experience Level: Intermediate and
  Advanced
For the more experienced diver, all along the Keys south of the main shallow reefs, are the Gulf Stream reefs. A prolific gallery of deep-water corals and fish, these deep dives are different from anything anywhere else in the Keys.
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ROCK KEY AND
EASTERN DRY ROCKS

Depth Range: 5-35 feet
Experience Level: All levels
Location: 24º27.21 81º51.60 Rock Key
Location: 24º27.50 81º50.44 Dry Rocks
Two popular dive spots typical of most reef formations in the area with long fingers of coral with sand and coral-filled canyons in between. But their real claim to fame are their 19th century wrecks - providing huge quantities of ballast and artifacts.
*****
WESTERN DRY ROCKS
Depth Range: 5-120 feet
Experience Level: Novice to Advanced
Further away from popular reefs closer to Key West, this area has not suffered the reef damage associated with heavy usage. Large quantities of elkhorn and staghorn coral, numerous crevices and caves, and large marine life make this well worth a long trip.
*****
ALEXANDER'S WRECK
Depth Range: 30 feet
Experience Level: Novice to Advanced
A destroyer escort, purchased from the Navy and sunk by local commercial salvor Chet Alexander, is a popular dive spot but only occasionally visited by commercial dive boats. The wreck is broken in half, with the stern section lying 150 yards or so north of the bow, whih is awash on most tides. Despite the fact that part of the hull is clear of the water, the wreck is difficult to see - a number of captains have hit the jagged metal tear that juts above the water, ruining props and rudders. This former navy vessel lies on its side and is home for thousands of fish and the hull itself is covered with Leavy oysters.
*****
THE AQUANAUT
Depth Range: 75 feet
Experience Level: Intermediate to
  Advanced
One of Chet Alexander's other dive sites is the wreck of the tugboat Aquanaut. This 55' wooden salvage tug sits upright in 75 feet of water on the edge of the Gulfstream on a flat sandy bottom. The tug is intact and in nearly perfect condition. The wreck hosts a variety of fish life, when on the deck of the ship a macro closeup lens is very useful.
*****
JOE'S TUG
Depth Range: 65 feet
Experience Level: Intermediate to
  Advanced
A small tugboat, discovered recently by a local diver, sits upright and is an easy swim through. Open access to the wheel house and aft deck make this an enjoyable dive. Visibility is usually good due to its location outside of the reef and offers a great photographic location with a wide variety of corals and marine life.
*****
COTTRELL REEF (GULF SIDE REEF)
Depth Range: 3-15 feet
Experience Level: Novice or
  Intermediate
An excellent reef for beginning snorkelers and an alternative dive spot when the weather is bad on the Atlantic side of the Keys. Covered with gorgonians and sponges, the ledges and banks of this reef provide a wide variety of reef fish.
*****
THE LAKES
Depth Range: 5-30 feet
Experience Level: All Levels
A fascinating snorkeling area, this shallow area is a series of grassy flats and banks completely encompassing a shallow lagoon protected by a string of islands and reefs directly west of Key West.
*****
MARQUESAS KEYS
Depth Range: 5-30 feet
Experience Level: All Levels
The only known atoll in the Atlantic Ocean. The circle of islands is about 3.5 miles across and 22 miles west of Key West and like most of the lower Keys is a bird sanctuary and National Wilderness Area. Wrecks in this area attract large marine life and huge clusters of coral heads can be found off the entire southern edge of the islands in about 8-12 feet of water. Several of the islands have long, white, sandy beaches and excellent anchorages can be found.
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