Dive site · access from Cocos Island
Dirty Rock
A cluster of volcanic rocks with sheltered channels; among the more forgiving Cocos sites while still delivering big hammerhead numbers.
- Depth
- 12–30m
- Current
- Moderate
- Minimum level
- Advanced open water
- Access
- Boat
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The case for it
Why dive here
- Boulders and pinnacles with hammerhead cleaning stations
- Galápagos sharks, eagle rays and green turtles
Check before booking
What may rule it out
- Advanced open water certification is the stated minimum.
- Moderate current can affect whether the site is suitable on the day.
Access and timing
Plan this through Cocos Island
Best overall months: Jun, Jul, Aug, Sep, Oct, Nov. Check the destination planner for operating season, wildlife and other matching sites.
Wildlife
Seen around Cocos Island
rareoccasionalcommonly seenpeak seasondestination closed
These are destination-level records, not confirmed sightings at Dirty Rock.
Giant oceanic manta ray
| Month | Likelihood |
|---|---|
| January | occasional |
| February | occasional |
| March | occasional |
| April | occasional |
| May | occasional |
| June | occasional |
| July | occasional |
| August | occasional |
| September | occasional |
| October | occasional |
| November | occasional |
| December | occasional |
Tiger shark
| Month | Likelihood |
|---|---|
| January | occasional |
| February | occasional |
| March | occasional |
| April | occasional |
| May | occasional |
| June | occasional |
| July | occasional |
| August | occasional |
| September | occasional |
| October | occasional |
| November | occasional |
| December | occasional |
Whale shark
| Month | Likelihood |
|---|---|
| January | rare |
| February | rare |
| March | rare |
| April | rare |
| May | rare |
| June | occasional |
| July | peak season |
| August | peak season |
| September | peak season |
| October | occasional |
| November | rare |
| December | rare |
Bigeye trevally
| Month | Likelihood |
|---|---|
| January | commonly seen |
| February | commonly seen |
| March | commonly seen |
| April | commonly seen |
| May | commonly seen |
| June | commonly seen |
| July | commonly seen |
| August | commonly seen |
| September | commonly seen |
| October | commonly seen |
| November | commonly seen |
| December | commonly seen |
Scalloped hammerhead shark
| Month | Likelihood |
|---|---|
| January | commonly seen |
| February | commonly seen |
| March | commonly seen |
| April | commonly seen |
| May | commonly seen |
| June | commonly seen |
| July | commonly seen |
| August | peak season |
| September | peak season |
| October | peak season |
| November | commonly seen |
| December | commonly seen |
Nearby alternatives
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Sources & last checked
Checked July 2026
Research is source-backed, but conditions and fees should still be confirmed locally.
View 2 sources and checking notes
- A Guide to the Dive Sites of Cocos Island, Aqua-Firma
- Best Dive Sites of Cocos Island, ZuBlu
Note on the data: Coordinates are approximate; not surveyed dive-site GPS.