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Grotta di Nereo

Sardinia · about 13 km from Alghero

Grotta di Nereo

  • Max depth35 m
  • CertificationOpen water / no overhead
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What it looks like

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Other people's footage, not advice: how someone else dives here says nothing about what suits your team. Dive within your training.

The dive

Tunnels, arches and air chambers with red coral, Leptopsammia, lobsters and morays. The classic loop runs up a tunnel to a daylit chamber and back through a >10 m wide sandy tunnel.

AMP rules (2025, unchanged in 2026): on your own only with the AMP's authorisation, in daylight, with at least a 2nd-level card plus a Cavern Diver card, max 4 divers and within 50 m of the buoy or your dive buoy. Otherwise only guided by an authorised centre: guide at least Cavern Diver, max 4 divers per guide and 8 per dive. Per site max 10 divers per dive and 3 dives a day; no night dives.
Source: AMP Capo Caccia–Isola Piana – Disciplinare 2025, art. 7 (stralcio) ↗Source: AMP Capo Caccia–Isola Piana – Disciplinare 2026, art. 7 en 20 ↗
Profile and sections

Tunnels, arches and air chambers with red coral, Leptopsammia, lobsters and morays. The classic loop runs up a tunnel to a daylit chamber and back through a >10 m wide sandy tunnel.

Grotta di Nereo is considered the largest underwater sea cave in the Mediterranean. Its length is ~300 m (+~500 m of passages) per it.wikipedia; en.wikipedia says 4 km.

Practical: the cave lies in Zone B of the Capo Caccia–Isola Piana AMP, which divides it into four sites (Fattucchiera, Tunnel, Cattedrali/Fiordo and Porticato). Capo Galera calls it suitable as a first cave dive. On your own you pay the AMP €10 a day in 2026.

Depth and profile
Entrances from a few metres down to ~-30 m (deepest), others at -16/-18 m; loop dive exiting at -18 m; max -35 m.
Configuration
All configurations; roomy tunnels.
DPV: Not DPV-suitable (estimate)
Short loop inside a protected area: not a scooter dive.
Who can dive where
  • CaveAt least Open water / no overhead
  • Whole caveConfigurations: Backmount / twinset / Sidemount / CCR / Small cylinders / no-mount (speleo sumps)
  • Whole caveGoes down to 35 m (trimix or deco may be needed) · doesn't decide who may dive
Depends on water level or swellPermission neededEntry or dive fee

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 from Alghero/Fertilia/Porto Conte: guided with a dive centre authorised by the marine protected area, or on your own with the AMP's authorisation and a Cavern Diver card; moor on the AMP buoy. Entrances at the foot of the Capo Caccia cliff, near the lighthouse.

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Around Grotta di Nereo

FillsNo fill station known nearby
Where to sleepAround Alghero on Booking.com ↗

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Caves nearby4 within 5 km

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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 (Sardinian regional cave cadastre, dive centres, DeepDivingAcademy, Scintilena, Wikipedia, Capo Caccia AMP rules, news reports; Sept 2026); Capo Galera, Alghero Divers, PADI and it.wikipedia for the caves at Punta Giglio and Capo Caccia (Oct 2026); Protec Sardinia (message, Oct 2026; the Grotta Sifone and the Grotta Masseduoe confirmed by Protec Sardinia, without a public location); the AMP rules (disciplinare) of 2025 and 2026 and Portoconte.it for the Capo Caccia caves (Nov 2026). Pins from the cadastre unless stated; the Grotta dei Fantasmi from OpenStreetMap, the Grotta del Bel Torrente from Grottocenter, the Grotta dei Cervi and the Grotta della Madonnina from it.wikipedia; ~ = estimate. Rules change — check locally.