Switzerland · about 6 km from Lugano
Sorgente Bossi (Böss)
- Max depth89 m
- CertificationFull cave
- SpecialSidemount
Diving and fills
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What it looks like
CAVE DIVING GONE WRONG| THE 2006 SORGENTE BOSSI CAVE DISASTER La sorgente Bossi (parte prima) Diving la Sorgente Bossi Cave System english version Sorgente Bossi ... Gaetano In Sidemount Kamaleont
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Videos and posts
From other divers, via YouTube, Instagram and Facebook. They only load when you click; after that, Google's or Meta's privacy rules apply.
CAVE DIVING GONE WRONG| THE 2006 SORGENTE BOSSI CAVE DISASTER La sorgente Bossi (parte prima) Diving la Sorgente Bossi Cave System english version Sorgente Bossi ... Gaetano In Sidemount Kamaleont
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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
The Sorgente Bossi is one of the largest karst springs of Monte Generoso. Water stays 4–5 years in the massif on average and the spring reacts slowly to rain, so conditions are stable almost all year.
1 earlier accident or incident has been reported at this cave. Read what happened ↓
Profile and sections
The Sorgente Bossi is one of the largest karst springs of Monte Generoso. Water stays 4–5 years in the massif on average and the spring reacts slowly to rain, so conditions are stable almost all year. Visibility is good, except deep down and in the narrow parts.
The first dives were in the 1970s (to -47 m); S1 was first passed in 1993.
Practical: going beyond the sump (-89 m) needs special permission. The regulations of 3 December 2024 allow no compressors at the spring and no hazardous substances; the landowner accepts no liability.
- Depth and profile
- S1 390–400 m / -89 (entrance: ~1×1 m passage sloping at 45°) · S2 25 m · beyond, dry sections with shafts, lakes and further sumps · total development >2.7 km
- Configuration
- Narrow, steep entrance: sidemount is more practical, backmount is possible (estimate). CCR only with a Full Cave CCR certification. Scooters banned, no solo diving.
- DPV: Not DPV-suitable
- Scooters are banned (2024 regulations).
Who can dive where
- At least Full cave
- Configurations: Backmount / twinset / Sidemount / CCR / Small cylinders / no-mount (speleo sumps)
- Goes down to 89 m (trimix or deco may be needed)
- Experienced divers only
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
Only for registered and approved cave divers. Register online with the site manager Underwater Training CMAS.CH (sorgentebossi.ch) with ID, certifications (Full Cave minimum), a dive medical statement and insurance covering search and recovery. Once approved, the team leader books a date and collects the key from the designated contact. Fees per the manager's terms. The spring lies a few metres from the cantonal road Rovio–Arogno.
Around Sorgente Bossi (Böss)
FillsNo fill station known nearby
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News
All (1)
Accidents and incidents
What happened at this cave before, with the sources. No names are given; read it as a lesson for your own planning.
- Fatal accidents in October 2006 (during an exploration dive) and on 9 January 2016: a diver became separated from the team in the narrow, turbid passage and was found at ~-70 m.
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 13 Nov 2026.
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