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There are Dive Watches. And then there are Dive Watches.
Most dive watches are built to survive underwater. Some are built to look the part.

The Bühlmann Decompression 02 was built for something else entirely - to manage decompression.

Rooted in the research of Swiss pioneer of depth and dive safety, Albert A. Bühlmann, this is not a symbol of diving, it is an analog horological instrument born from it.

Some watches measure time.
This one measures risk.
The Legacy
Dr. Albert A. Bühlmann was a Swiss scientist whose pioneering decompression research transformed modern diving. His ZH-L decompression algorithms remain the foundation of dive computers today.

Bühlmann Watches was founded to honour this scientific legacy and translate it into innovative and complicated horological instruments inspired by the science of safe diving.

Bühlmann Watches develops new kinds of horological complications. We develop and engineer "habillage" components to become functional elements which work in connection with movement to provide relevant information and data for diving, and other activities, where an analog safety back-up instrument becomes of vital importance.
About us

The Brand

We translate science to horology. We develop habillage complications. We are powered by scientific collaborations.

  • Science +
    Horology
    Science made modern diving possible. Exploration pushed its limits.

    Bühlmann Watches turned knowledge into reliable analog back-up timekeeping instruments which blend functional cases and movement to provide information.

    Together they form the Bühlmann Equation - the principle behind every Bühlmann watch.
  • Habillage
    Complications
    Bühlmann Watches develops and engineers habillage components to become functional elements that work in connection with the movement - with the purpose of providing relevant information or data, for diving and other activities, where an analog safety back-up instrument is of vital importance.


  • Scientific
    Collaborations
    Bühlmann collaborates with the diving community and scientific organisations for the development and testing of its products.

    Research partnerships with Divers Alert Network Europe (DAN) contribute real dive data to the ongoing study of decompression science, while testing with CMAS Switzerland divers helps refine the usability and functionality of Bühlmann watches.
The Watch
The Decompression 02 is the successor to the Decompression 01 launched in 2021. Better, bolder and safer, it is conceived as an effective analog mechanical back-up instrument inspired by the science of safe diving.

The twin turning dial features the 0-700m ASL Bühlmann circular decompression table, operated in connection with the Twin Safety Bezel to measure decompression stops and total dive time.

Powered by the slim Swiss-made SW300 automatic movement and produced in a limited edition of 575 pieces, the Decompression 02 is not merely a professional dive watch - it is a tribute to the scientific foundations of modern diving.
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Explore the Features
We built the Decompression 02 the way it had to be built. Every function serves a single purpose - helping divers manage risk
Decompression Stops
The Twin Decompression Stops Dial® features the 0-700m ALS Bühlmann dive table decompression times for the 17 "golden zone" recreational dive profiles on the turning bottom dial.
Decomprression Timing
The Bühlmann Twin Safety Bezel® enables the separate tracking of the total dive time (TDT) and decompression stops (DS), each with its own fail safe blocking direction. A first in watchmaking.
Focus on what matters
The Bühlmann Twin Safety Bezel® enables the separate tracking of the total dive time (TDT) and decompression stops (DS), each with its own fail safe blocking direction. A first in watchmaking.
Functional case
The robust stainless steel case construction is designed for underwater reliability. It is inclined by 5° inclination to assure perfect dial legibility above and below water. Water-resistance is of 57.5ATM - 575m - 1885ft.
Super luminous
The grade X1 Swiss Superluminova® pigments used on the Decompression 02 have a 60% increased afterglow performance after two hours compared to standard grades. Long term legibility according to ISO 3157 is extended by at least a factor of 1.6.
Comfort & Ergonomy
The Decompression 02 is an extremely comfortable watch to wear due to its ergonomic concave case-back shape and a flexible joint placed at the 12 o'clock lug. These features assure a snug fit for any wrist size.
Luxury finishes
The "Druckkamer blue" dial - inspired by the colour of of Dr. A. Bühlmann's decompression chamber at the University Hospital of Zürich - emphasises legibility and functional beauty. It is executed with a fine sunburst finishing and the rhodium indexes are hand-applied. The decompression bezel is made out of glossy hi-tech ceramics.
Learn more
How it Works
Plan. Dive. Manage.
Plan
Plan your dive and set your chosen profile on the watch by turning the decompression dial (depth - bottom time) until it shows in the dial opening at six o'clock.
Control
Measure your total dive time (TDT) by aligning the "0" triangular marker on the TDT bezel with the minutes hand just before immersion.
Dive
Dive to your target depth and measure your bottom time by checking the minutes hand versus the scale on the total dive time bezel.
Ascend
Resurface by maintaining a max. ascent rate of 10m per minute. Check this with the seconds hand and your depth meter.
Decompress
Read the depth of your first decompression stop and the corresponding decompression time on the dial. Ascend, and upon reaching the first decompression stop, align the "0" marker on the decompression bezel with the minutes hand and time the stop. Once the time has elapsed, ascend to the next decompression stop and repeat the procedure until you resurface.
Stay safe
When you are back on the boat turn the decompression dial until the fly-no-fly position appears in the opening at 6 o'clock and point the triangle to red. Once the triangle points to green after 36h-48h you are safe to fly.
See how it works
Instrumental Beauty
The Decompression 02 is a masterpiece of Swiss horological art. The mechanical expression of purpose and dive safety.
Secure a
Decompression 02
Second drop of 200 pcs
Price valid until 31.3.2026
Third drop of 175 pcs opens on 01.04.2026 at the price of CHF 3'990
First drop of 200 pcs sold out on 31.01.2026
Decompression 02
Full payment
Limited edition of 575 pcs
Second drop of 200pcs
CHF
3'790.00
Details Pre-order now
Decompression 02
50% deposit
Limited edition of 575 pcs
Second drop of 200pcs
CHF
1'895.00 (50% deposit)
Details Pre-order now
Decompression 02
DAN Members Edition
Full payment
Limited edition of 575 pcs
Second drop of 200pcs
CHF
3'790.00
Details Pre-order now
Decompression 02
DAN Members Edition
50% deposit
Limited edition of 575 pcs
Second drop of 200pcs
CHF
1'895.00 (50% deposit)
Details Pre-order now
FAQ
Terms & Conditions
Technical specifications
  • Type of production
    • Swiss made
    • Top grade production
  • Size
    • 48.5mm diameter
    • 58.5mm lug to lug
    • 17.2mm thickness
  • Movement
    • Swiss made Sellita SW300 automatic mechanical movement (3.60mm thickness)
    • Functions: Hours, minutes, central seconds, date (converted to fly-no-fly indicator)
    • Jewels: 25
    • Winding: Mechanical, self-winding, 28’800 bhp/4Hz
    • Power reserve: 56 hours
  • Case
    • Stainless Steel 316L (1.4435 grade with higher chromium and nickel content for enhanced corrosion resistance and resistance to saline water)
    • Twin safety total dive time and decompression security stops bezels
    • Decompression time bezel in high-tech ceramics with X1 grade Superluminova® numerals
    • Sapphire crystal with anti-reflective treatment
    • Engraved screwed case-back with 8 screws
    • 5° case inclination
  • Dial
    • Twin decompression dial with turning bottom dial
    • "Druckkammer blue" upper dial with sunburst finishing
    • Black matt turning bottom dial printed with 17 "golden zone" recreational dive profiles from the Bühlmann 0-700m ASL dive table
    • Luminous X1 grade Superluminova ® coated minutes hand and indexes
  • Strap
    • Black perforated - fine adjustment - rubber strap with stainless steel pin buckle
    • Flexible strap joint on the 12 o’clock strap lugs for snug and comfortable fit on all wrist sizes
    • Strap width 19.2mm
  • Water-resistance
    • 57.5 ATM - 575m - 1885ft
    (Equal to Bühlmann's depth record in the Druckkammer at the Zürich University Hospital)
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Reviews
Prof. Alessandro Marroni
Founder DAN Europe
Working with Prof. Bühlmann was instrumental in shaping the early stages of my career. At DAN Europe, I am pursuing that mission alongside our research and medical team, evolving universal algorithms into personalised decompression strategies. This watch honours that legacy while supporting vital research that is shaping the future of dive safety.
Sean Paul L.
A blog to watch
The Bühlmann Decompression 02 is one of the most advanced dive watches in years, offering one of the most comprehensive all-in-one mechanical diving packages ever.
Beat Müller
Former member of Dr. Bühlmann's research team
As a young engineer and an enthusiastic diving instructor, deeply interested in decompression research, it has been an outstanding experience to work with Dr. Bühlmann as a research associate, a programmer and a test diver. The Bühlmann Decompression 02 is a marvellous piece of micro-machinery and Swiss precision. It reflects in noble form Prof. Bühlmann’s endeavour to enhance the safety of all divers worldwide, now and in the future.
Matthias L.
Switzerland
I believe that the Bühlmann Decompression 02 is a very exclusive, unique and beautiful specimen. I also believe that wearing it makes you a special breed of scuba diver. It doesn’t only say “I’m a scuba diver”, but “I’m a scuba diver, who knows and values scuba history, likes unique designs and quality made in Switzerland.
Nikko
Finland
I am amazed by the genius idea and exceptional execution! The achievement here is admirable to say the least! This is a unicorn and I hope to add this watch to my collection someday. Well done Bühlmann Watches.

Shreyas S.
USA
One of the most interesting dive watches i've handled in a while.
Jim C.
USA
Second best mechanical dive watch in the world! Singer Dive Track being the first, although ($98K to$125K) somewhat pricier. Only two things would keep me from buying this watch: 1. In my seventies, I do not dive anymore. Physiology you understand. My diving era was the '70's and '80's. I could have made full use of this instruments capabilities back then had it existed. 2. I have to live my life IAW my values, so as much as I desire this - - - I would not purchase one thereby denying an active diver their chance to have this outstanding tool upon their wrist.

This instrument achieves perfection for its intended usage.
Vuk R.
It's about time
The Bülmann Decompression 02 is the most complete dive watch ever made.
Video review by Beans & Bezels
In the Press
FAQ
Partners
Bühlmann Watches collaborates with leading organisations in the diving ecosystem for research, testing and data
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