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Sicily

Grotta dell'Olio (Capo Gallo, Palermo)

  • Max depth30 m
  • CertificationCavern
  • Water temperature≈ 15–27 °C, varies with the seasonestimated, no reports yet

Diving and fills

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Fills nearby

  • La Perla Nera Diving~68 km, by ferry or boatAir, nitrox and trimix (separate compressors plus a Haskel booster); O₂ not stated — ask
  • Ustica Diving Center~68 km, by ferry or boatAir and nitrox (max 36% O₂, €10 supplement, nitrox certification required); trimix and O₂ not stated — ask
  • Blue Diving Ustica~68 km, by ferry or boatNot stated (60 cylinders in stock) — ask
All fill stations and places to stay ↓

The dive

The entrance is rimmed by a vermetid reef ('trottoir a vermeti'). Inside you see groupers and moray eels, now and then a dentex or amberjack, encrusting sponges and starfish; on the sand floor lie anchors and old amphorae.

Capo Gallo–Isola delle Femmine AMP: guided only by a centre from the municipality and with the AMP's permission; in zone A (west of the lighthouse) diving is prohibited altogether. Dig up or take nothing: the cave is of archaeological interest.
Busy water: canoes, boats and swimmers above the entrance; ascend only at the boat or inside the cave.
Profile and sections

The entrance is rimmed by a vermetid reef ('trottoir a vermeti'). Inside you see groupers and moray eels, now and then a dentex or amberjack, encrusting sponges and starfish; on the sand floor lie anchors and old amphorae. Visibility is 15–25 m. It is a busy bay, so canoes and boats pass above you.

Of Capo Gallo's 23 caves, this is the only one with its entrance underwater.

Depth and profile
Underwater entrance (at low tide wide enough for a canoe), then a partly flooded cave with branches, arches, light shafts and places where you can surface; max -20 m (Duikersgids) to -30 m. Length not published.
Configuration
Roomy openings: recreational gear, backmount or sidemount; an easy dive according to the logs.
DPV: Not DPV-suitable (estimate)
Short, guided cave: no scooter.
Who can dive where
  • CaveAt least Cavern
  • Whole caveConfigurations: Backmount / twinset / Sidemount / CCR / Small cylinders / no-mount (speleo sumps)
  • Whole caveGoes down to 30 m (trimix or deco may be needed) · doesn't decide who may dive
Permission neededThrough a dive centre or guide

This is how the planner decides who in your team may dive this cave. Rules your own trip adds (organizer, a mail, the AI) show with your trip.

How to get there

By boat (~30 minutes) with a dive school from Palermo or Isola delle Femmine, on the west side of Capo Gallo, ~4 km from Mondello. You book through a centre, which asks the Capo Gallo–Isola delle Femmine AMP for permission; in summer people snorkel to the entrance without permission, which is not allowed.

Plan your route ↗

Around Grotta dell'Olio (Capo Gallo, Palermo)

Fills3 fill stations · nearest 68 km
  • La Perla Nera Diving

    ~68 km, by ferry or boat

    Piazza Capitano Vito Longo 5, 90051 Ustica

    Air, nitrox and trimix (separate compressors plus a Haskel booster); O₂ not stated — ask

    Not stated — ask

    Since 1999; the island's first PADI 5 Star centre, run by a PADI Course Director. Rebreathers are 'more than welcome'; DSAT Tec Rec and cave specialty courses; own workshop and air-quality testing. Dives the Grotta dei Gamberi, Grotta delle Cipree, Piramidi/Cirri and Punta Falconiera, among others. Ask about walk-in fills.

  • Ustica Diving Center

    ~68 km, by ferry or boat

    Piazza Umberto I, 90051 Ustica

    Air and nitrox (max 36% O₂, €10 supplement, nitrox certification required); trimix and O₂ not stated — ask

    Not stated — ask

    Centre run by an islander; PADI and SSI courses, cavern/cave via SSI. Guided dive €55 (€70 with rental kit), boat passage €15, night dive €70 per the price list. Dives the Cirri, Cipree, Gamberi and Pastizza caves. Ask about walk-in fills and CCR support.

  • Blue Diving Ustica

    ~68 km, by ferry or boat

    Piazza Vito Longo 4, 90051 Ustica

    Not stated (60 cylinders in stock) — ask

    Open all year, busiest in summer

    PADI centre with two 7.5 m RIBs. Dives the Grotta dei Gamberi II, Grotta della Pastizza, Scoglio del Medico ('La Balena') and the Piramidi, among others. Ask about fills and CCR support.

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Certification requirements, configurations and trimix depths are estimates for planning. Always check them locally and dive within your training. Compiled from web research (Oct 2026): the Isole Egadi AMP regulation (DM 1 June 2010) and the decrees for Capo Gallo (2002), Plemmirio (2004) and the Pelagie (2008) via mase.gov.it, SUB magazine (Marettimo, 2020), Il Giornale dei Marinai (2023), divingaway.com, balarm.it, Duikersgids, milazzo.life, the PADI pages of Blu Tek Diving, Capo Murro Diving Center and Nike Diving, the SIMSI chamber list (March 2024), AGI (2021), Wikipedia; for the Plemmirio caves the AMP's route pages and 2026 rules (disciplinare) and Capo Murro Diving Center's site (Nov 2026). Only those two caves have a pin, from the buoys in the AMP rules; for the others the map links search the place. Rules change — check locally.