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Croatia

Nikolajova jeskyně (Sveta Marina)

  • Max depth35 m
  • CertificationCavern
  • Water temperature≈ 9–20 °C, varies with the seasonestimated, no reports yet
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Diving and fills

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Fills nearby

  • Fill stationDive Center Krk (Kornić)~36 km, by ferry or boatAir and nitrox (to 40 % €8, to 100 % €14 per fill, 2026); air in your own cylinder only with a valid inspectionRoute ↗
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The dive

A small sea cave with a sandy floor near the mouth of Jadrina bay. ~30 m right of the entrance there is a vertical crack (~70 cm × 6 m) with large morays.

Profile and sections

A small sea cave with a sandy floor near the mouth of Jadrina bay. ~30 m right of the entrance there is a vertical crack (~70 cm × 6 m) with large morays. Visibility avg ~11 m; water 9 °C (April) to 20 °C (September).

Depth and profile
Entrance at -24 m (~6 m wide); the cave runs 15–20 m into the rock and narrows; max -35 m
Configuration
All configurations; narrow at the back
DPV: Not DPV-suitable (estimate)
Small cave; no point.
Who can dive where
  • CaveAt least Cavern
  • 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 swell

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 small boat from the Sv. Marina campsite (1.9 km), in calm weather only; moor in Jadrina bay or in a sheltered cove 350 m further south.

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Around Nikolajova jeskyně (Sveta Marina)

Fills1 fill station · 36 km

  • Dive Center Krk (Kornić)

    ~36 km, by ferry or boat

    Dunat 50, 51517 Kornić, Krk

    Air and nitrox (to 40 % €8, to 100 % €14 per fill, 2026); air in your own cylinder only with a valid inspection

    Daily 9:00–19:00

    PADI 5 Star Dive Resort by Dunat beach (Kornić) with three boats. Dives a string of caverns and tunnels in the Kvarner: Vrbnik Cave on Krk, Big Cave and Blue Hole off Cres, the Geierfels at Plavnik and the Prvić tunnel. Guide €12 per dive (2026). No trimix or cave courses mentioned.

    Website ↗Navigate ↗

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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 (Garašić EGU 2017, Subterranea Croatica 2019, HGSS 2014, Wikipedia, stranypotapecske.cz, wannadive.net, dive centres, Kornati NP, Croatian Ministry of the Sea, KBC Rijeka, OXY, news; Sept 2026); for the Kvarner the pages of Dive Center Krk, JU Priroda and Wikipedia (Oct 2026). Pins come from Wikipedia, stranypotapecske.cz and wannadive.net; five springs have a pin from OpenStreetMap, one site has none (yet). ~ = estimate. Rules change — check locally.