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Socorro Islands diving – The Mexican Galapagos

Don Silcock heads for the Socorro Islands, a Pacific Ocean ‘bucket list’ destination that is almost synonymous with giant oceanic manta ray encounters.


Photographs by Don Silcock.

Often referred to as the ‘Mexican Galapagos’, the Socorro Islands, a group of four islands located some 600km from the west coast of Mexico, are so special that in July 2016, they were inscribed as a UNESCO World Heritage Site. Then, in November 2017, the government of Mexico created North America’s largest marine-protected area, making the whole area a national park with total bans on fishing, mining and tourism development.

Confusingly though, Socorro is actually just one of the four islands that make up the Archipiélago de Revillagigedo – the correct name for this location…

However, most English-speaking people struggle with actually pronouncing Revillagigedo. So, the pragmatic Mexicans stopped trying to use the formal name with most foreigners and refer to the archipelago as ‘Socorro’.

Schooling hammerheads at the Socorro Islands.
Schooling hammerheads at the Socorro Islands.

Location, location, location!

Semantics out of the way… just why are these islands quite so special? The answer to that question is really quite simple – location!

The four islands of San Benedicto, Clarion, Roca Partida and Socorro are actually the peaks of underwater volcanoes. Which, in turn, are part of a submarine mountain range far below the surface. The overall location is where the north-east Pacific Ocean marine biogeographic region converges with that of the Eastern Pacific. It is also where the California Current meets the Equatorial Current, all of which creates an incredibly complex and highly productive transition zone.

With the only landfall in such rich waters, Socorro Islands diving offers an incredible mix of resident sharks, manta rays and dolphins. Plus, the islands act as beacons to migratory species such as humpback whales and whalesharks. Little wonder then that the area is renowned for being a ‘big animal paradise’.

Socorro Islands diving - whale shark.
Socorro Islands diving – whale shark.

Getting to the Socorro Islands

The sheer remoteness of the Revillagigedo Archipelago means that Socorro Islands diving is not something to take lightly… Just getting there is an adventure in itself!

For North American divers, it is not too bad as all the liveaboard dive boats servicing Socorro operate from Cabo San Lucas, the major resort city on the southern tip of Mexico’s Baja California peninsula.

Known for its beaches, sea-sports and nightlife, Cabo (as it is commonly referred to) is a busy place that is very well serviced by all the major US airlines. For the rest of the world, some long-haul flights are required and for us Australians, it is a journey of epic proportions!

Getting to Cabo is just the first part of the overall journey though, as it is another 24 hours by boat to get to San Benidicto Island, the nearest of those four islands to Mexico.

San Benedicto Island.
San Benedicto Island.

Socorro Islands Diving

1. San Benidicto Island

Formerly known as Isla de los Innocentes, San Benedicto at some 10 km² is the third largest of the four islands in the archipelago. Very much volcanic in origin, it has no source of fresh water and is completely uninhabited.

San Benedicto is visually striking and has two very prominent features. Bárcena, near the southern tip of the island, is the volcanic crater left from its eruption in 1952. Viewed from sea level, Bárcena is impressive, but viewed from a drone, it is simply awesome!

Second are the volcanic arch and nearby pinnacles on the west side of the island, which when viewed up close are truly awe inspiring.

Socorro Islands diving - 10. The pinnacle at El Boiler.
Socorro Islands diving – 10. The pinnacle at El Boiler.

San Benidicto Island – ‘El Boiler’

There are a number of dive sites around San Benedicto, such as Fondeadero and the Canyon. They are good, but none of them comes close to El Boiler, which is located near to the volcanic arch and is an absolutely incredible dive!

The site consists of a huge pinnacle that rises up from the seabed at 45m, coming to within 4m of the surface. That top area is to be avoided because of surge and swell, but the rest of the site is straightforward, and you basically just choose your depth and then make your way around the pinnacle.

El Boiler is a tremendous place to encounter oceanic manta rays, as they use the pinnacle as a cleaning station.

“The amazing thing about the giant mantas is that they are quite used to divers… and being intelligent and curious creatures, they will often initiate the encounter and come to you!”

So the best way to dive El Boiler is stay relatively shallow to conserve air, then make your way around the pinnacle, watching out for the mantas. Obviously, there is no guarantee they will appear, but they usually do and when that happens, try to separate yourself a bit from other divers and wait. There is simply no point in trying to chase them – they are just too fast. Better to let them come to you!

Giant Oceanic Manta Ray at the Socorro Islands.
Giant Oceanic Manta Ray at the Socorro Islands.

San Benidicto Island – silky sharks

While the oceanic manta rays are very much the stars of the show at El Boiler, the dependable co-stars at San Benidicto Island are the resident population of silky sharks (Carcharhinus falciformis). Clearly very used to the liveaboard dive boats that visit the island, the silkies gather in some numbers around the boat looking for scraps.

Relatively large animals, with an intense curiosity and bold attitude, silky sharks are considered to be potentially dangerous.

Silky shark under the boat at San Benedicto Island/
Socorro Islands diving – Silky shark under the boat at San Benedicto Island.

2. Socorro Island

Socorro is by far the largest of the four islands at some 132 km2. It is an impressive sight when first seen, particularly so from a drone! It is also the only island that is inhabited, albeit by about 250 Mexican Navy personnel and their families, their role being to enforce the rules and regulations of the marine protected area and national park.

There are three main dive sites around Socorro Island – Punta Tosca, Roca Oneal and Cabo Pearce. The first two are certainly interesting dives, but Cabo Pearce is very much the main attraction and its stars are ocean manta rays and bottlenose dolphins! Plus, schooling hammerheads are often seen out in the blue.

Cabo Pearce is a long finger formation that is located on the eastern side of the island and was created by lava flow from when Socorro was an active volcano. Underwater, that finger extends right out into the deep surrounding waters.

Care is required at Cabo Pearce as strong currents run either from the south to the north, or vice versa, which strengthen as they sweep across the top of the underwater part of the lava finger. Both the oceanic mantas and bottlenose dolphins are used to interacting with divers and will come to you, which makes for some really great encounters!

Socorro Islands diving - Curious Oceanic Manta.
Socorro Islands diving – Curious Oceanic Manta.

3. Roca Partida

Located about 100km to the west of Socorro Island, Roca Partida is the visible tip of a huge underwater mountain. It is hard to imagine a more-remote, awe-inspiring and exciting dive site!

Compared to the three other islands, Roca Partida is pretty small. Just 100 metres long and eight metres wide, and the name means ‘Split Rock’, which refers to the two peaks on the rock – one 25 metres high and the other 34 metres.

“Its sheer and complete isolation means that Roca Partida has its own ecosystem and resident population of marine creatures.”

Plus, it naturally attracts migratory animals and you just never know what may appear around the corner!

Swept as it is by strong easterly currents, Roca Partida is best dived by entering the water around the middle of the rock on the east side, which is the ‘split point’ for the current and where the water velocity is minimal.

Then it’s a choice of left or right to the corners of the rock, where the current is strongest and the action is pumping.Huge schools of fish pulse in the current, sharks are a constant presence and the chance for random pelagic encounters make the corners of Roca Partida an incredible underwater experience!

Socorro Island diving  - Sleepy whitecaps at Roca Partida
Socorro Island diving – Sleepy whitecaps at Roca Partida.

Finally… a really interesting feature of Roca Partida are its snoozing whitetip sharks. Located on the eastern side of the rock are several recesses that act as ‘shark platforms’. These are where the resident whitetip sharks, which hunt at night, gather during the day to rest.

Seemingly safe in numbers, the recesses are often crammed to overflowing with whitetips.

Socorro Islands Diving  – in summary.

The four islands of the Archipiélago de Revillagigedo are truly very special. While only three of the four are dived regularly – Clarion Island is another 290km to the south-west of Roca Partida and very few boats go there – diving Socorro, San Benidicto and Roca Partida is an experience that will stay with you for many years.

The combination of their remote location, exceptional biodiversity, incredible encounters and exciting diving are hard to match – anywhere.

About Don Silcock   

In more normal times, Don is based from Bali in Indonesia, but is currently hunkered down in Sydney. Visit his website Indopacificimages for Don’s extensive location guides, articles and images on some of the best diving locations in the Indo-Pacific region and ‘big animal’ experiences globally.

Read the full Digital Scuba Diver Issue 44

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