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Greece

Thynni (Kyparissi)

Info · exploration

Information only: a research expedition (Into Kortia). No source says the cave is open to visiting divers.

Source: InDEPTH – State of Cave Exploration 2026 (Stratis Kas, Oct 2026) ↗
  • Max depth70 m
  • CertificationFull cave
  • SpecialExperienced divers
Directions

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Now at Thynni (Kyparissi)

Status
Closed

The dive

Beyond a narrow dry entrance lies a lake with very clear, still water of 16 to 24 °C, depending on depth. Below ~5 m the water is saline; seawater probably flows in around 20 m, but divers found no passage to the sea.

Nearby earthquakes count as a reason not to dive: unstable rock and sediment. Little emergency medical help nearby.
Source: InDEPTH – State of Cave Exploration 2026 (Stratis Kas, Oct 2026) ↗
Profile and sections

Beyond a narrow dry entrance lies a lake with very clear, still water of 16 to 24 °C, depending on depth. Below ~5 m the water is saline; seawater probably flows in around 20 m, but divers found no passage to the sea.

Dry cavers explored the cave from ~1993, and the first dive was around 2005. In October 2026 the Into Kortia expedition, led by Stratis Kas and Marysia Trepat Borecka with Ingo Apel as explorer, made the first real survey. The team collected at least three possibly new species.

Practical: information only.

Source: InDEPTH – State of Cave Exploration 2026 (Stratis Kas, Oct 2026) ↗
Depth and profile
~70 m at the end of the line and in a side passage, with a restriction at ~70 m; more than 1,000 m surveyed in October 2026 (InDEPTH).
Configuration
Expedition dives on trimix with decompression of sometimes more than an hour.
Who can dive where
  • CaveAt least Full cave
  • Whole caveConfigurations: Backmount / twinset / Sidemount / CCR
  • Whole caveConfiguration unknown — research beforehand · doesn't decide who may dive
  • Whole caveGoes down to 70 m (trimix or deco may be needed) · doesn't decide who may dive
  • Whole caveExperienced divers only · doesn't decide who may dive
Dry sections / haulingExperienced divers

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.

Source: InDEPTH – State of Cave Exploration 2026 (Stratis Kas, Oct 2026) ↗

How to get there

Near Kyparissi (Laconia). One narrow dry entrance: the gear is lowered on ropes and carried ~25 m to the lake inside.

Plan your route ↗

Around Thynni (Kyparissi)

FillsNo fill station known nearby
Other sites6

News

Access and rules change: check what applies locally right before your trip. Source: GDELT Project and the news feeds of diving magazines. Search for more news ↗ Searched automatically, last on 11 Nov 2026.

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Sources, sharing and disclaimer

Sources

Source: InDEPTH – State of Cave Exploration 2026 (Stratis Kas, Oct 2026) ↗

Current conditions

Visibility, flow and water levels change quickly. Right before your dive, check what other divers report:

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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 (cave pages of the Greek teams T2B, Grafas Diving and Addicted2H2O, wannadive, Wikipedia, Greek news reports 2015–2026, summaries of diving laws 3409/2005 and 4688/2020; Sept 2026); for Rhodes the dive centres Lepia and DiveMed, Scuba Hellas, Tribloo and Duikersgids (Oct 2026); Lepia Dive Centre (message, Oct 2026); for Crete and the Ionian Islands Grafas Diving, Addicted2H2O, divernet (Martyn Farr, 2018), showcaves.com, cretanbeaches.com and the pages of the dive centres Aquatic, Achilleon, Blue Adventures and Eurodivers (Oct 2026). Sea caverns at Lindos and on Kefalonia and Ithaca from the pages of Lepia and Aquatic (Oct 2026). For Paros the pages of Paros Divers (amphitritecave.com, parosdivers.com), T2B, Addicted2H2O and the municipality of Paros; for Drakos–Selinitsa in the Messinian Mani Addicted2H2O, Grafas Diving, showcaves.com, the German Wikipedia and the journals of the Northern Pennine Club (1982) and Cambridge Underground (1983) (Nov 2026). The springs of Polydrosos, Kolethra and Ladonas from Addicted2H2O (also by e-mail, Nov 2026), Grafas Diving, allovergreece.com, Amazing Evia and travel.gr (Nov 2026). Pins from T2B, wannadive, showcaves, OpenStreetMap or Wikipedia (see each site); ~ = estimate. Rules change — check locally.