WATCH ANGELS – Buhlmann Decompression 02 Steel Dive Watches Edition

WATCH ANGELS – Bühlmann – Decompression 02 "Druckkammer" First Edition Steel 48.50 mm Dive Watches 2025

 Swiss horology meets Swiss dive science in the new Bühlmann Decompression 02

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Better, Bolder and Safer than its precursor, the Decompression 02 is the functional and usability evolution of the widely acclaimed Bühlmann Decompression 01 first introduced in 2021. 

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It is the first mechanical dive watch to feature a twin safety diving bezel and a twin decompression stops dial to safely manage decompression stops for dives in the "Golden Zone".

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The foundations of modern dive safety were laid by Dr. Albert A. Bühlmann, whose pioneering research from the late 1950s to the 1980s resulted in the ZH-L16 decompression algorithm, a model still employed by most dive computers and tables today. Bühlmann's work was revolutionary for its completeness, as it addressed decompression at sea level and at altitude, thereby creating a model applicable to the full range of diving environments. 

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Dr. Albert A. Bühlmann in the Druckkammer at the University Hospital of Zürich in 1978

The Decompression 02 has been imagined as a professional mechanical dive watch that can be used as a backup to a digital dive computer. It has been built the way it had to be built, with no concessions to established dive watch design conventions. 

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The Decompression 02 incorporates the ZH-L16 decompression algorithm and has been conceived in collaboration with professional divers. Furthermore, it has been functionally validated by decompression science specialists, including former members of the Bühlmann research team, the Divers Alert Network (DAN) Europe and the World Underwater Federation Switzerland (CMAS Switzerland).

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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.

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Beat A. Müller, MSc Mech. Eng. ETH and former member of the Bühlmann Research Team at the University Hospital of Zürich 

​Better

The watch introduces several innovative features. It's the first dive watch to feature the Bühlmann Twin Safety Bezel®, a twin diving bezel that enables the separate tracking of the total dive time (TDT) and decompression stops (DS), each with its own fail safe blocking direction. 

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 The decompression stop times for the 17 dive profiles featured on the Bühlmann Twin Dive Dial® are derived from Dr. A. Bühlmann's renown dive tables which still, after 40 years, remain among the most widely used and widely adopted by the diving industry, including in dive computers. 

“My father always believed that science should serve safety. I am proud to witness his groundbreaking work embodied in this exquisite mechanical instrument — and supporting DAN Europe's research — a true continuation of his life's mission.”
Thomas Bühlmann, board member Bühlmann Dive Watches

​Safer

Plan, Dive, Fly: The Bühlmann Decompression 02 accompanies the diver in every phase of a dive and after a dive. 

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How? Firstly, the diver establishes the dive profile in terms of maximum dive depth, the time spent at that depth and the bottom time (BT). This profile is then set on the watch by turning the right crown - the profile data and the related decompression stops time will appear in the opening at 6 o'clock.  

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The decompression data appears in the opening at 6 o'clock. In this example the data for a dive to 36m depth with a 30min bottom time

Next, the total dive time bezel (inner bezel) is set to 0 by putting the 0 marker in correspondence with the minutes hand before starting the dive. Once the bottom depth is reached, the Diver can follow the chosen dive profile in terms of bottom time on the total dive time scale. 

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When it is time to resurface, the maximum rate of ascent is measured using the seconds hand and the decompression stops at 9m,6m and 3m depth are measured by using the outer decompression time bezel. At the end of the dive, the diver will turn the bottom dial to the "Fly-no-Fly" position and set the indicator to "No-fly". It will be safe to fly once the arrow points to the green zone. 

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The fly-no-fly indicator. When the triangle points to green it is safe to fly. When it points to red it is unsafe to fly. 

For what regards the available dive profiles, the Decompression 02 focuses on the “Golden Zone” dive profiles — these are the 17 most common dive profiles for single-tank dives up to 39 meters depth (for dives at altitudes from 0 to 700m ASL). The twin dial construction allows divers to view decompression data through a rotating lower dial, operated mechanically with the crown positioned on the rigth. 

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The three crowns of the Bühlmann Decompression 02. They allow to set time, set the dive profile and to operate the Twin Safety Bezel.

“The Decompression 02 was designed to complement dive computers, not to compete with them. It's the mechanical expression of scientific rigour and a limited edition collectible which embodies true Swiss craftsmanship. We built it the way it had to be built: with no concessions to established dive watch design conventions.
Guido Benedini, CEO, Bühlmann Watches
Honouring a common Legacy: DAN Europe Research and Bühlmann Dive Watches. 

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The Bühlmann Decompression 02 is at the source of a the partnership between DAN Europe and Bühlmann Watches. It represents a shared long term commitment to advancing dive safety through science. At its core is a mutual belief in the power of research to save lives and in the importance of honouring the pioneers who laid the groundwork. 

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Bühlmann Watches will associate the DAN Europe Medical Research Fund and raise awareness about its quest to develop the perfect decompression algorithm, an algorithm which takes the individual diver's characteristics (sex, weight, age etc.) into account. The legacy of Dr. A. Bühlmann, whose decompression tables remain the global standard, will be used to promote DAN Europe’s ongoing research and educational mission. 

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”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.
Prof. Alessandro Marroni, Founder and President, DAN Europe

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A portion of each Buhlmann Decompression 02 watch sale will be donated to the DAN Europe Medical Research Fund. DAN Europe members will be able to access an exclusive execution of the watch, featuring the DAN Europe logo, reinforcing their role as ambassadors of safety. This partnership is a tangible way for divers to contribute to the future of their sport. By wearing the Bühlmann Decompression 02, they signal their commitment to science, legacy, and the pursuit of safer diving for all. 

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 Technical Features

Model:  Decompression 02 "Druckkammer" First Edition

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The 48.50 mm stainless steel Decompression 02 with ceramic bezel is powered by a slim Swiss made Sellita SW300 mechanical automatic movement and has a sapphire crystal. 
The other notable features are:

    Legacy-based design and usability: Inspired by Bühlmann’s original circular decompression calculator with "Golden Zone" logic: 17 most frequent dive profiles and a "fly-no-fly" segment
    Twin Safety Bezel®: Two counterrotating bezels for total dive time (clockwise block) and deco time (counterclockwise block) 
    Twin Decompression Dial®: Two dials with a rotating sub-dial featuring the ZH-L16 decompression data, visible through a sapphire opening
    XXL minute hand: Enhanced readability for timing decompression stops, total dive time and ​bottom time
    Minimalist hour hand: Keeps visual focus on the minutes hand and the dive and decompression timing
    5° case inclination: Improves dial legibility
    Helium valve: to prevent damaging the watch after prolonged stays in mixed gas pressurised atmospheres
    Flexible strap joint: Adapts the watch to all wrist sizes for maximum fit and comfort 
    Detachable Strap extension: providing the extra length to wear the watch over your wetsuit
    Concave case back: for extra wear comfort 
    575m water-resistance: a depth that matches Bühlmann's own hyperbaric record and the necessary water-resistance with a sufficient safety margin for diving in the "Golden Zone"
    Special dive box: a unqiue box for that special gift and a practical box to travel with the watch
    Swiss made: a guarantee of horological quality, manufacturing standards and manufacturing sustainability

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Prices, edition and sales information
The Bühlmann Decompression 02 with the signature "Druckkammer Blue" dial celebrating Dr. A. Bühlmann's legacy will be manufactured in a limited edition of only 575 pieces. 
Retail price is CHF 3'990.00. The watch can be purchased exclusively on watchangels.ch starting December 4th 2025.

🔰Edition ✅Only ❱❱❱ 575 Pieces 
🔴 Price: $ 4,990 US / CHF 3'990💰  

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About Bühlmann Dive Watches

Bühlmann Dive Watches is the brainchild of Thomas Bühlmann, the son of Dr. Albert Bühlmann. The Swiss maison manufactures meaningful and distinctive mechanical diving watches for serious divers. They integrate Dr. A. Bühlmann's decompression algorithms and his dive safety vision in design, usability and functionalities. By wearing a Bühlmann, you signal your commitment to science, the pursuit of safer diving for all and to horological ingenuity. The brand is operated by the parent company of the Watch Angels platform, GFF Suisse SA.

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Guido Benedini
CEO at Bühlmann Watches
+41793566434
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Sara Roncati
PR Manager at Dan Europe Foundation
+39 3341962665

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