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Revillagigedo Islands stand out for technical diving due to their volcanic seamounts plunging from 30m to over 100m, hosting shark nurseries and manta cleaning stations unseen elsewhere. Unpredictable currents and deep blue descents demand tec skills, rewarding divers with whale shark passes and hammerhead tornadoes. No land-based ops exist; liveaboards provide the only access to this Pacific frontier 280-450km offshore Baja.
Prime tec sites circle Roca Partida's guyot base for multi-species sharks to 60m, El Boiler's walls for manta ballets beyond 40m, and Clarion's slopes for rare pelagics. Divers log 3-4 profiles daily from rib tenders, staging deco amid dolphins and silkies. Night dives reveal whitetips on reefs, while surface intervals spot humpbacks.
Dive November-June, with January-March offering cooler 22C water and peak shark action; expect 15-35m viz, moderate-strong currents, and 25-40m average depths pushing to tec limits. Prep with 50+ dives, AOW, Nitrox, and current comfort. Liveaboards supply air/trimix; bring personal gear for 8-10 day trips.
Military-protected islands limit visits to permitted liveaboards, fostering a tight-knit community of shark researchers and photographers. Crews share unpublished intel on deep aggregations, blending Mexican hospitality with hardcore diving ethos. Local legends of giant mantas circulate among captains.
Book liveaboards 12-18 months ahead through operators like Aggressor or Nautilus, confirming tec-specific itineraries with trimix fills and deco support. Target November-May for optimal conditions, avoiding summer swells that shut down access. Verify operator tec ratings, as standard trips cap at 40m but select charters allow certified teams to 70m+.
Arrive in Cabo with full tec kit serviced, as island resupplies are nil. Practice negative entries and SMB deployments in currents pre-trip. Secure DAN insurance covering hyperbaric evacuations, given 24+ hour crossings to chambers.