Desecheo Island diving

An island you can dive but not visit

Desecheo is a small, steep, uninhabited island in the Mona Passage, the channel between Puerto Rico and Hispaniola. On land it is a national wildlife refuge and closed to the public, partly because of unexploded ordnance from its past military use. Divers see it from the water only, and that is the point: the island sits in deep, open water far from river runoff, which is why its reefs are known for clear visibility.

The waters around the island are protected as a marine reserve. Boats come out for the day, dive around the island and head back to the mainland in the afternoon. No one lands.

What the diving is like

The island’s slopes continue underwater, so dives range from shallow reef on the island’s shoulders down to deeper sections where the bottom drops away. Hard and soft corals, large sponges and sea fans cover the reef. The rock has many ledges, caverns and swim-throughs, where light comes through gaps and schools of small fish shelter.

Because the island is isolated, you have a better chance of meeting larger animals than on the coast. Turtles are common, and eagle rays, barracuda and other passing open-water fish are possible. In winter, humpback whales migrate through the waters off the west coast, and you may hear or see them on the boat ride.

Desecheo’s reefs are a good contrast to the La Parguera wall: less a single dramatic drop-off and more a varied island landscape with rock features to explore.

Getting there

Trips leave from the west coast, mainly from Rincón and Aguadilla. The crossing takes roughly an hour each way, depending on the boat and the sea. Most operators run two-tank trips and pack lunch and water for the day.

The Mona Passage is open water, and conditions change. Swells, especially in winter when northern swells reach this coast, can cancel trips. Plan your Desecheo day early in your stay and leave room to move it if the weather turns.

Who it suits

Desecheo is best for divers with some experience. Long boat rides, open-water conditions and possible current mean you should be comfortable in the water and confident with your buoyancy. Many operators ask for an advanced certification or recent logged dives. If you get seasick, take your usual precautions before the crossing, not after.

• Bring a surface marker buoy and know how to deploy it.
• Carry a dive light for the caverns and swim-throughs.
• Stay with your guide in overhead areas, and only enter where you have trained to.
• Check the gear list for the essentials on offshore days.

Combining Desecheo with other dives

Many divers pair a Desecheo day with shore days around Rincón and a few days on the south coast. Because the trip depends on the weather, book it for the start of your stay, then add other activities around it. If it is cancelled, you still have time to try again before your flight.

Rincón and the west coast

Rincón is a laid-back town best known for surfing, with sunsets over the Mona Passage and a lighthouse park where people watch for whales in winter. It makes an easy base for Desecheo days and for land trips between dives. Aguadilla, a little north, has the west coast’s main airport, Rafael Hernández (BQN), with direct flights from the US mainland, so you can skip the drive from San Juan.

If Desecheo gives you a taste for the Mona Passage, the next step is Mona Island, a full expedition farther out. Compare all the regions on the Puerto Rico dive sites page.