Tinian Grotto
The most popular cavern dive on Tinian, a boat dive with three entry points: divers enter through the top hole, explore the cavern, exit through another opening and search the wall for shrimp and crabs. Depth is about 25 m at the lowest exit. Use a local guide.
Facts
- Region: Mariana Islands – Guam & Saipan
- Area: Tinian
- Depth: 0–25 m
- Level: intermediate
- Current: moderate
- Type: cave
- Coordinates: 15.07, 145.628 (approximate)
- Highlights: cavern, shrimp, crabs, cave exits
- Unverified: No published GPS found; the pin is a map-based placement and is only indicative. (NW Tinian)
- Tips: Cavern diving needs overhead-environment awareness and a guide who knows the exits.