Dive-site story
Saipan's Grotto is an iconic collapsed limestone cavern connected to the open ocean by three underwater exit holes. Divers descend a steep set of concrete stairs down into the cavern before giant-striding into the interior pool. Once submerged, glowing cobalt light pours through the massive arches leading outside to the open reef wall, where sea turtles, pelagics, and schooling fish patrol the blue.
Striking electric-blue ambient light illuminating the cavern interior from external underwater passages
Three distinct natural swim-through exit tunnels leading directly into the open ocean
Expansive outer reef wall frequented by cruising sharks and sea turtles
Location
Use the map to plan with your operator and confirm the exact entry point on the day.
Seasonality
Calmer seas during late spring through autumn minimize swell and make cavern entries and exits safer.
Marine life
| Species | Likelihood | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Whitetip Reef SharkTriaenodon obesus | Common | ||||||||||||
| Green Sea TurtleChelonia mydas | Common | ||||||||||||
| Napoleon WrasseCheilinus undulatus | Seasonal | ||||||||||||
| Blackfin BarracudaSphyraena qenie | Common | ||||||||||||
| Bumphead ParrotfishBolbometopon muricatum | Seasonal |
Marine forecast
Book with DIVEROUT
