Roca Hundida

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What you'll see (19)

Striped Shore CrabPachygrapsus crassipesseen 70× near here

Pacific Purple Sea UrchinStrongylocentrotus purpuratusseen 34× near here

California MusselMytilus californianusseen 34× near here

Sunburst AnemoneAnthopleura solaseen 25× near here

Ochre Sea StarPisaster ochraceusseen 24× near here

California Horn SnailCerithideopsis californicaseen 24× near here

Giant Green AnemoneAnthopleura xanthogrammicaseen 17× near here

Atlantic Ribbed MusselGeukensia demissaseen 17× near here

Gooseneck BarnaclePollicipes polymerusseen 16× near here

Pacific Calico ScallopArgopecten ventricosusseen 16× near here

Wavy TurbanMegastraea undosaseen 13× near here

Bat StarPatiria miniataseen 11× near here

Pink Volcano BarnacleTetraclita rubescensseen 11× near here

Noble DoridPeltodoris nobilisseen 9× near here

Aggregating AnemoneAnthopleura elegantissimaseen 9× near here

Dark UnicornMexacanthina lugubrisseen 9× near here

Giant Rock ScallopCrassadoma giganteaseen 8× near here

California SeahareAplysia californicaseen 7× near here

California Spiny LobsterPanulirus interruptusseen 7× near here

Planning a trip

8–12 days

worth going for

Long haul, usually two flights.

14,385km from Singapore — about 24h each way, so two of those days are travel. 3 dive sites within 25km.

When people dive it

Busiest Apr.

From 4,941 logged sightings — when divers are in the water, which is not quite the same as when visibility is best.

Dive Crew is a dive group from Singapore. Members plan trips here, log their dives, and share their photos of each site.

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Moon and tides

Waning gibbous

71% lit · day 20 of the lunar month

Neap tides

Neap tides — the smallest range of the month, so the weakest currents. Easy conditions and usually the clearest water, though a drift site may barely drift.

New 10 Oct Full 26 Oct

Phase computed here, not fetched. This is the spring/neap cycle, which sets how hard the water moves — not a tide table: no free source publishes high and low water for Southeast Asian reefs, and the range peaks a day or two after the moon does, by an amount that varies with the coast. For times on the day, ask the operator.

Getting there

~25h 3m

door to water, each way · 4 legs

FlightSan Diego (SAN)~21h 33mFlight time plus the airports at both ends. A connection adds to it.Find flights →
Transferthe jetty~1hRoad transfer to the coast, usually arranged by the resort or liveaboard.Directions →
Ferrythe crossing~2hAt this distance the last stretch is a scheduled crossing rather than a dive boat, so book it before the flight — a missed sailing usually costs a day. Which crossing it is has been worked out from the distance and not from a timetable; ask the operator.
Dive boatRoca Hundida~30 minThen the dive boat out from the island.

📍 Roca Hundida on Google Maps 🧭 Route from San Diego

Times marked ~ are estimated from straight-line distance and will be roughly right at best. The road legs are the ones Google Maps answers properly; it will not plan the ferry or the dive boat at all. A dive site's coordinates put a pin in open water, so the map link drops you on the site, not on a jetty.

Details

Max depth: 30m
Type: yes
Island: Isla Piedra Blanca
Country: Mexico
Marks: 31°42.169'N 116°41.630'W
Position: 31.7028, -116.6938

Where it is

Loading the map…

Nearby

Sightings and photographs from iNaturalist contributors, research-grade records within 6km, under Creative Commons licences. Counts are what divers and snorkellers have bothered to log — a common fish with few records is common all the same.