We track 3 dive operators in Alligator Reef. 2 teach certification courses (2 PADI). 2 run snorkelling trips. Listings are ordered by Fin Rank: a published score for how complete and verified each listing is.

Captain Hook's Marina & Dive Center is a PADI 5 Star IDC offering a full range of dive and snorkel services. They provide daily dive trips, PADI courses from beginner to instructor, and equipment rental. They are located in Marathon, Florida Keys.
Abyss Dive Center is a PADI 5 Star Dive Center located in Marathon, Florida Keys. They offer daily dive and snorkel trips, PADI certification courses, and equipment sales and service. They are known for their knowledgeable staff and excellent customer service.
The 3 highest-ranked of 3. How Fin Rank works
| Rank | Operator | TripAdvisor | Try dive | Agencies | Website | |
|---|---|---|---|---|---|---|
| 1 | 4.7(394) | 4.5 | none | PADI | Visit |
Which centres run each site, named on their own websites or confirmed by the owner.
Fin lists 3 dive operators in Alligator Reef. 2 of them run certification courses.
PADI is the most common agency (2 centres).
2 of the 3 operators we track run snorkelling tours.
Operators are sorted by Fin Rank, a 100-point profile strength score: contact details, what they offer, the dive sites they run, their Google reputation, whether the owner has claimed the listing, and whether their own website links to Fin. 0 listings here are owner-verified. The formula is published in full on the Fin Rank page.
| 2 | Abyss Dive Center | 4.8(203) | 5.0 | none | PADI | Visit |
| 3 | Captain Hook’s Big Pine Key | 4.9(556) | none | none | none | Visit |