Bajo Alcyone

Named after Cousteau's Alcyone; divers drop to a plateau around 25 to 30m and hold on to watch hammerhead schools pass over the seamount.

Depth

25–40m

Current

Strong

Diver level

Advanced open water

Entry

Boat

Unique features

Submerged seamount, Cocos's top hammerhead site
Permanent shot line for a fast negative descent into current

Sources & last checked

Checked July 2026

This is a researched draft, not yet human-verified. The seasonality and logistics are drawn from the sources below — confirm specifics (permits, fees, closures) with an operator before you book.

A Guide to the Dive Sites of Cocos Island — Aqua-Firma
Cocos Island Diving, Costa Rica — Dive The World

Note on the data: Coordinates are approximate; not surveyed dive-site GPS.