Phreatic

Casa
Italia
Cala Gonone
Phreatic

Phreatic exists to grow knowledge on groundwater resources & marine caves to insure their protection.

24/08/2026

Nell’agosto 2026 Phreatic APS ha condotto due settimane di ricerca, esplorazione e documentazione speleosubacquea nella sorgente di Su Gologone, Monumento Naturale di Oliena.

Il progetto, in accordo con il Comune di Oliena e con il supporto della società Le Fonti, ha coinvolto speleosubacquei da Italia, Stati Uniti, Polonia, Belgio, Germania e Regno Unito.

Il programma scientifico ha incluso attività biospeleologiche coordinate da Fabio Stoch, ricercatore dell’Université Libre de Bruxelles, con biotrappole posizionate fino a 75 m di profondità. Gli aspetti idrogeologici sono stati seguiti dall’idrogeologo Francesco Murgia, studioso dell’acquifero carsico del Supramonte.

Per raggiungere le biotrappole, le squadre hanno attraversato la grande sala a circa 80 m di profondità, risalendo poi il pozzo fino a circa 60 m e proseguendo nella condotta superiore. Il settore appartiene alla storia delle esplorazioni profonde della risorgiva: Olivier Isler raggiunse circa -107 m nel 1998 e Alberto Cavedon circa -135 m nel 2010.

Uno dei principali risultati della sessione 2026 è stata l’esplorazione di una galleria ascendente che da profondità prossime ai 100 m risale fino a circa 50 m, sviluppandosi verso la Grotta di Mussin Tomasu. Secondo il rilievo di Phreatic APS, il punto terminale si trova a circa 100 m in linea d’aria dal suo ingresso GPS.

Nello stesso settore è stata rinvenuta una sagola preesistente con marker orientati verso l’interno di Su Gologone, forse riconducibile a precedenti esplorazioni da Mussin Tomasu. Il 18 agosto 2019 Thorsten “Toddy” Waelde esplorò la Condotta Giovanni Badino fino a circa -124 m, individuando una diramazione verso Su Gologone. L’origine della sagola dovrà essere confermata da nuove esplorazioni e dal confronto dei rilievi.

I risultati costituiscono un avanzamento nella documentazione e nella comprensione idrogeologica di Su Gologone, offrendo nuovi elementi per investigare la relazione fisica con Mussin Tomasu.

Blueprint Subsea SUEX - The Submarine Exploration CompanyFederazione Speleologica Sarda Comune di Oliena Jon Kieren SJ Alice Bennett Kirill Egorov Sebastian von Koss Daniel Worlwide Andres Nötzli Peter Brandt Dorota Czerny Zach Peletz Base1 Sardinia

10/06/2026

Everyone talks about the ocean on World Ocean Day. We want to talk about what feeds it.

Groundwater and the ocean are not separate systems. The water moving through the caves we explore eventually reaches the sea — carrying minerals, contaminants, biological tracers.
Protecting the ocean starts underground. And underground is where almost nobody looks.

— Follow — we look there

22/05/2026

How do I get involved?”
We get this question every week. Here’s the answer.

Phreatic is a volunteer group. Nobody here has a salary, a title, or a uniform. What we have is a shared conviction that submerged caves and groundwater systems deserve more attention than they currently get — and that the people who can access them have a responsibility to document what they find.
You don’t need a PhD. You don’t need a specific certification or training agency.

You need to be a competent cave diver, willing to show up, carry tanks ( LOTS of tanks), follow protocols, and contribute to something that outlasts any single dive. If you want to be part of it, the first step is a conversation.

get in touch and be part of us

13/05/2026

WATER 💧

The water that enters a cave is not the same water that exits. In between, it tells you everything.

Submerged caves aren’t just environments to explore — they’re direct windows into the health of an aquifer. Every parameter we measure is an indicator: pH tells us how acidic the water is and why, conductivity reveals mineral load and anthropic anomalies, nitrates trace agricultural pressure on the water table, dissolved oxygen measures the ecosystem’s capacity to sustain endemic life.

This data doesn’t exist without someone going in. No drone, no satellite, no remote sensor reaches a flooded passage deep under the ground .

and you never know what you might find

08/05/2026

CAVE SURVEY

No GPS. No aerial view. This cave map exists because someone went inside and measured everything by hand.

The process is called cave survey. On the surface it sounds simple: go in, measure distances and angles, record everything on a device. Underwater, with limited visibility, full equipment, and gas to manage, it’s something else entirely.

Every survey is a dedicated dive — you do explore and map at the same time or need extra dives to complete the survey. Collect all the data underwater, then process it on the surface using specialist software to produce maps and three-dimensional profiles.

The result is a document that didn’t exist before. A representation of a place that very few people will ever see directly.

This carousel walks through the process, step by step

EXPLORATION MEANS NOTHING WITHOUT DOCUMENTATION

04/05/2026

Cala Luna Project — 2026 Season Kickoff

The first project week of 2026 in Cala Luna is complete.

Our new team members stepped in strongly, bringing rebreathers past the no-mount restrictions and opening access to new sections of the system.

Cartography and survey coverage have been extended, and several potential dry leads have been identified for future exploration.

All of this was achieved in just a few days of diving.

Great logistics, awesome people, and a strong result.

A special thanks to Anze Abram and Dennis Wachter for spearheading the effort.

More to come.

24/04/2026

Every sample we bring to the surface tells the story of an entire system

You never knows what you’ll end up finding
Some times just nothing 😅

11/04/2026

CITIZEN SCIENCE :

Every diver can become a scientist.
You don’t need years of study — you need to know what to collect and how.

Tag someone who should know this.

03/04/2026

Sardinia is one of the oldest continental blocks in the Mediterranean.

The so-called Sardinian-Corsican block is a fragment of European crust that separated from the Iberian Peninsula around 20 million years ago, rotating into its current position.

Part of this block is made up of carbonate rocks — limestones and dolomites deposited in tropical marine environments between the Cambrian and the Jurassic, roughly 540 to 150 million years ago.

These rocks are soluble: rainwater absorbs atmospheric CO₂ to form carbonic acid, weak but sufficient to dissolve calcium carbonate along fractures and joints in the rock.

The process is called karstification. It operates on geological timescales: millions of years of percolation widen fractures into conduits, conduits into passages, passages into complex systems.

When the water table drops or sea level changes, some passages drain. Others remain flooded — they become the submerged caves we explore.

In Sardinia, karstification is particularly developed in the Palaeozoic limestone areas of the Iglesiente and Sulcis, and in the Mesozoic formations around Dorgali, Orosei, and the Nurra. Old, compact, fractured rock. Tens of millions of years of dissolution.

Not by chance. The result of a specific lithology, sufficient rainfall, and geological time long enough to carve what we explore today.

30/03/2026

Who wants to help us turning silence into datas ?

Indirizzo

Via Colombo 15
Cala Gonone
08022

Sito Web

http://www.phreatic.org/, https://www.facebook.com/PBSardinia

Notifiche

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