Sea cave
Grotta Utopia
A sea-entered cave below high cliffs in the Gulf of Orosei, reached by a 30 to 40 minute boat ride from Cala Gonone. A triangular entrance shaft drops to 28 m into a large, deepening system reported at more than 7 km and explored to 120 m.
ProTec Sardinia describes the Utopia as reached by boat to a point where cliffs rise up to 400 m from the sea. Divers descend to about 13 m, where a triangular entrance in the rocks drops to 28 m; at the bottom of this shaft a very large cave system opens, first running parallel to the cliffs and then heading inland, growing larger and deeper.
According to the same provider, the cave was discovered and systematically explored by the German HFGOK group in the late 1990s to 4.2 km. In 2013 Rick Stanton and a local explorer extended Markus Schafheutle's line from 102 m to 120 m, and the provider gives the current size as more than 7 km. A 2023 Undercurrent reader report describes a guided dive to about 32 m that followed the guideline into the large opening.
The provider describes long decompression with air and recommends different gases; this is a cave for experienced, qualified cave divers.
The environment
A large, roughly circular flooded tunnel system behind a deep entrance shaft, increasing in depth inland.
Every fact on this page, with its source (7)
| Fact | Status | Source |
|---|---|---|
| The dive leads to about 13 m, where a triangular entrance drops to 28 m. | Reported | [1] |
| The entrance shaft bottoms out at about 28 m, where the main system begins. | Reported | [1] |
| In 2013 the line was extended from -102 m to -120 m, and the cave continues.Provider statement; no survey publication found. | Reported | [1] |
| The cave was discovered by the HFGOK in the late 1990s and explored to 4.2 km; the provider gives its present size as over 7 km. | Reported | [1] |
| A July 2023 reader report describes a dive to 31.8 m following the guideline into a very large cavern opening. | Reported | [2] |
| The provider says the system should only be visited by experienced cave divers. | Reported | [1] |
| No official access information was found; the provider reaches the site by a 30-40 minute boat ride. | Reported | [1] |
Verified: stated by an official or primary source we opened. Reported: from a secondary source only. Sources conflict: the note gives both versions. May be out of date: the newest source we found is old.
Written in our own words from the sources above. Report a correction