Italy
8 regions · 54 sites · down to 227 m
Italy combines cold, deep resurgences in the north-east (Valbrenta) with dozens of sea caves along the coast, from Liguria and Monte Argentario to Palinuro, Sorrento, Salento and Ustica. Sardinia has both: sea caves with fresh water in the Gulf of Orosei and deep springs in the Supramonte. Many sea caves lie in marine protected areas (AMP), where you may only dive guided and within quotas.
Map
Not to be missed
- Grotta del Bue Marino →
A sea cave below the cliffs of the Gulf of Orosei, with fresh water of 14–16 °C over a halocline; you dive it from Cala Gonone with a cave centre.
- Grotta dell'Elefante Bianco (Laghetto di Ponte Subiolo) →
A deep spring (227 m) with water of 8–9 °C, only for experienced full cave divers on trimix or CCR; notify every dive to the municipality at least 10 days ahead.
- Grotta Azzurra di Palinuro →
The best-known cavern of Capo Palinuro, to 30 m, where fresh, sulphurous spring water flows into the sea; never breathe air from air bells.
- Grotta dei Gamberi →
One of the nine official caves of the Ustica marine reserve, to 50 m; guided only, with a cave speciality and in small groups.
- Grotta delle Corvine →
A short, shallow cavern (17 m) on the Ionian coast near Porto Selvaggio, good for cavern divers; skip it in westerly wind, when the surge sucks.
- Grotta dello Zaffiro →
A cavern to 16 m in the Punta Campanella marine reserve, dived by boat with a local centre.
Regions
- SardiniaSea caves that turn into freshwater springs in the Gulf of Orosei (Bue Marino, Bel Torrente, Utopia), the deep Su Gologone spring and the protected sea caves of Capo Caccia near Alghero.10 caves · down to 137 m
- ValbrentaThe cold karst springs of the Brenta valley: the Elefante Bianco (to -227 m), the long sumps of Oliero and the tight Fontanazzi, plus the Gorgazzo and Goriuda in Friuli. Water at 8–9 °C, and at most springs you notify or book first.7 caves · down to 227 m
- Palinuro and CilentoSea caves of Capo Palinuro, some with warm sulphur springs (Grotta Azzurra with the Sala della Neve, Cala Fetente), and the shallower caves of the Costa degli Infreschi marine protected area near Marina di Camerota — by boat with a local centre.10 caves · down to 50 m
- LiguriaShort sea caves and caverns along the Ligurian coast: the Grotta dei Gamberi and La Colombara in the Portofino marine reserve, the strictly regulated Grotta marina di Bergeggi and the Grotta del Tinetto off Porto Venere — nearly all by boat and with a dive centre.4 caves · down to 40 m
- Monte ArgentarioThe Argentarola islet off the west coast of Monte Argentario, with the speleothem-filled Grotta Grande (and a tight, deep shaft for full cave divers) plus a small cave, and the Grotta Azzurra on the south coast — all by boat from Porto Santo Stefano or Porto Ercole.3 caves · down to 40 m
- Sorrento and Punta CampanellaShallow sea caves in the Punta Campanella marine protected area on the Sorrento peninsula — Zaffiro and Isca with air bells full of formations, the 80 m Grotta di Mitigliano and Punta Falcone — by boat with a local centre; the Grotta Azzurra on Capri is closed to divers.5 caves · down to 30 m
- SalentoShort, life-rich sea caves in Salento's limestone coast: around Porto Selvaggio and Santa Caterina (Nardò) on the Ionian side, and near Otranto and the Ciolo on the Adriatic side — with air bells, freshwater springs and dives to ~-25 m.7 caves · down to 25 m
- UsticaVolcanic island off Palermo with Italy's first marine protected area (1986): nine official underwater caves, from the shallow Pastizza near the harbour to the deep Grotta dei Gamberi (-42 m) and Grotta dei Cirri — guided only, with an authorised dive centre.8 caves · down to 50 m
Good to know
- In the AMPs (Capo Caccia, Ustica, Bergeggi, Infreschi, Punta Campanella) you usually dive caves only guided with an authorised centre, with a maximum number of dives per cave per day.
- In the Valbrenta you book the Oliero caves online, at least 3 days ahead. Elefante Bianco must be notified to the municipality at least 10 days ahead, Gorgazzo at least 7 working days ahead.
- Sea caves are reached only by boat, and in summer many tour boats pass the entrances. Ascend with a buoy and at your own boat.
- Water varies a lot: 8–9 °C in the Valbrenta, 14–16 °C in Sardinia's freshwater caves and around 22–26 °C at sea in summer. At Palinuro there is hydrogen sulphide and fine silt.
- Fatal accidents have happened in the Valbrenta and at Palinuro. Dive there only within your certification and with someone who knows the cave.
Tips for safe and enjoyable diving
- After heavy rain the springs flow hard and visibility drops sharply; in Sardinia sometimes to 1 m or less. Plan spring dives for dry periods.
- Arrange your gas in advance. Base One in Cala Gonone and La Perla Nera on Ustica fill trimix; there is no fill station in the Valbrenta itself. For CCR, always ask about oxygen and sofnolime beforehand.
- Emergency numbers: 112, ambulance 118, coast guard 1530, DAN Europe +39 06 4211 5685. From Cala Gonone every chamber is hours away; call 112 and DAN first.
- Check that your centre is authorised for the marine reserve and has a cave-certified guide; on Ustica this is required for all caves.
- Rest day: the Bue Marino and Grotta del Fico show caves in Sardinia, a boat tour in the Grotta Parolini at Oliero, or the Grotta Zinzulusa in Salento.
Certification requirements, configurations and trimix depths are estimates for planning. Always check them locally and dive within your training.
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