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Bajo Alcyone

Cocos Island, Costa Rica · 25–40m · advanced · exposed

Seamount off Cocos Island, 500km from the mainland, where hammerheads school in the current above the pinnacle.

Conditions today

Retrieved · refreshed hourly

poor

Poor — 1.6m effective waves in the morning window.

Limiting factor: waves

Wave height
1.4–1.6m
Wave period
8.9–10.9s
Wind chop
0.1–0.5m
Sea temp
29–29.1°C

Ranges span today's hours. Wave height here is the raw sea state — the rating scales it for how exposed the site is. Exposed — open water with nothing to block the swell, so it is scored at full height.

Next few days

  • TodayPoor — 1.6m effective waves in the morning window.poor
  • SundayMarginal — 1.4m effective waves in the morning window.marginal
  • MondayMarginal — 1.3m effective waves in the morning window.marginal

Each day is scored over its morning dive window, the same as today's rating.

Dive briefing

AI-generated

This seamount dive works between 25 and 40 metres and demands advanced certification. Conditions are poor today due to waves — expect 1.6m effective wave height during the morning window — which will make entry and exit challenging on this exposed site. Sea temperature is stable at 29 to 29.1°C.

Divers commonly log whitetip reef sharks here, along with Cocos wrasse, Mexican hogfish, guineafowl puffer, blue-and-gold snapper, bluefin trevally, Galápagos gregory, and leather bass. The current above the pinnacle typically draws schooling hammerheads, though sightings are never guaranteed. Given today's sea state, assess your team's tolerance for surge carefully before committing to the water.

Written by Claude (claude-haiku-4-5-20251001) from the rating, forecast, and sightings on this page — it has no other source and cannot look anything up. Treat it as a summary, not as local knowledge.

Commonly seen here

Most-recorded species near this site, ranked by research-grade iNaturalist sightings from divers, snorkelers, and naturalists.

Species come from iNaturalist — research-grade sightings logged by divers, snorkelers, and naturalists nearby. The ranking reflects what people photograph most, not guaranteed abundance. Ask a local operator what's actually being seen. Species names link to iNaturalist for range maps, seasonality and more photos. Photos by iNaturalist contributors under Creative Commons licences — individual credit on hover.