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Decompression theory - Decompression during diving

The comprehensive book on decompression

Diving is more than just diving down and surfacing – anyone who wants to dive safely needs to understand what's happening in their body. In "Decompression Theory," Veronika Sievers and Dr. Dominik Elsässer explain the physical, physiological, and mathematical principles of decompression in a well-founded, understandable, and practical way.

From its historical beginnings with Haldane and Workman to M-values, Bühlmann's computational model, gradient factors, and the question of the best decompression strategy: this book provides a comprehensive overview. Why does decompression sickness (DCS) develop? Is it really just the bubbles, or do immune responses play a role? How do decompression gases and trimix affect decompression? What is the significance of the "helium penalty," deep stops, or the role of the endothelium?

Understandable and practical

This book is an indispensable companion for anyone wanting to delve deeper into diving theory – from dedicated recreational divers to technical divers. Besides the fundamentals of tissue saturation, half-lives, and M-values, it also covers advanced topics such as repetitive dives, decompression gases, oxygen windows, trimix, nitrogen narcosis, and the psychological aspects of decompression sickness (DCS).

With many practical examples (including subsurface diving) and a broad overview of the current state of research, "Deco Theory" offers a valuable wealth of knowledge for both beginners and experienced divers.

Price 35 EUR plus shipping, New

I sell this high-quality regulator set from Poseidon, Model X Stream, including a metal pressure gauge. All components are Poseidon original parts.

The regulators have not been used for diving so far and are therefore in an unused condition. The revision in 2025 ensures that everything is technically perfectly prepared

1200EUR

Mülheim an Ruhr

Hello fellow divers,

I'm selling my serviced dive set, which has just been serviced by Taucher-technik.de / Michael Reiter. The cylinders have a new TÜV inspection and are therefore fully functional, clean, and rust-free. A new manifold has been installed, and the regulators have been completely tested and serviced. Replaced parts are included. This set is therefore not comparable to other sets here, as almost no inspected items are sold on classifieds sites. Please keep this in mind when making your inquiry.

Price: 1500 EUR

For sale is a complete technical set consisting of:
- Double 10-bottle system with new bridge and new TÜV inspection
- Apeks regulator set including octopus 2nd stage
- Polar air pressure gauge
- DiveRite Harness with knife and additional equipment plates (no photo, but I can send one)
- Backplate
- Rec Wing by Dive Rite (tested)
- As you can see in the pictures, the drain valve and inflator hose on the wing have been replaced! New, unused, and tested! The springs are now made of stainless steel.

If you have any questions, feel free to call me.

So why am I selling a set that's had fresh replacement parts, a TÜV inspection, and a complete overhaul at considerable expense? The answer is unfortunately simple: I have two small children ;) and therefore, due to a lack of time for diving in Hemmoor, I've decided to sell my equipment for now. However, I don't sell untested junk, so you can be sure you're getting good, working gear here. I'll include the invoices for the overhaul and the replacement parts. Of course, there's no warranty as this is a private sale. I used the set sporadically for the previous two years. Best regards, Phil

Shipping via freight carrier is possible, but I would prefer a viewing in 24632 Lentföhrden, Schleswig-Holstein. We can also arrange to meet in Hamburg. I would release the compressed air before shipping and accept no liability for transport damage, but I will pack securely and carefully.

Phone: +49 1781492292

PS: I have more photos, feel free to ask.

Hamburg

Stage controller Scubapro MK17 with S550, pressure gauge & hoses – 120 EUR VB

As part of my hobby exit, I offer a complete stage controller from Scubapro , ideal for technical diving or as a backup setup.

Equipment:

• 1st stage: Scubapro MK17 (membrane-controlled, suitable for cold water)
  • 2nd stage: Scubapro S550
  • Pressure gauge (Fini) with display up to 400 bar
  • HD hose & MD hose – already installed
  • Compact configuration – perfect for stage bottles

Note:
The regulator is subject to revision – has not been used for a long time. Function not tested, therefore sold expressly as used and without warranty.

Condition:

Used, visually maintained, but with technical maintenance recommendation.

Location:

The item is available for viewing and pick-up in Solingen .

If you have any questions, please do not hesitate to contact me at +49 171 3266977
Only self-collection – no shipping!

Note: Other diving items are available for sale on site - eg drysuits, fins, booties, tanks and much more.
If you are interested, just contact us!

Price: 120 EUR (negotiable)

Solingen NRW Bei fragen bitte anrufen :)

As part of my hobby, which I unfortunately have to give up, I offer high quality double equipment for sale, ideal for technical diving or demanding recreational dives. All equipment is neat and ready for use.
Available dual devices:
• Double 18 liters – Price: 450 EUR VB
Equipment:
• Valve and bridge available
• Fully assembled without TÜV
Condition:
Used, but very well maintained and fully functional.
Location:
The equipment can be viewed and picked up in Solingen. No shipping – only self-collection!
Contact:
If you are interested or have any questions, please contact us at:
+49 171 3266977
Note:
Other diving items are also available on site - eg drysuits, fins, booties, tanks and much more.
Just talk to them!

Solingen NRW Bei fragen bitte anrufen :)

Aqua Lung diving boots / neoprene shoes size 37 + neoprene booties XS

Price: 29 EUR (negotiable)

Selling a pair of black Aqua Lung neoprene diving boots in size 37 with side zipper and profiled rubber sole.

A pair of separate neoprene booties in size XS are also included.

The equipment is used, is in decent visual condition and has not been used for a long time.

Ideal for diving and various water sports activities.

Sold as pictured.

Collection in Braunschweig or shipping possible if buyer covers costs.

Private sale excluding any liability for material defects.

Braunschweig

I am selling here a new and unused interchangeable head for lamps of the Light&Motion Gobe series. This lamp head is unused, in its original packaging and includes a new O-ring and lubricant.

GoBe Focus LED head red light in a perfect wavelength with a 60° beam angle. The GoBe Focus Red Light LED Head allows for discreet viewing at night for wildlife observation and underwater photography, especially for night dives.

- 60° beam
- 165 lumens red light - certified according to FL-1 standard
- Fits the Gobe Standard body or the Gobe+ body
- Best CREE LEDs
- Self-developed reflectors optimize the light for maximum efficiency and balanced distribution

Condition: New

Asking price: 35 Euro

Private sale. Shipping available, or pick up in Mannheim

Sell a Apeks FST first stage with an ATX 50 ESC.

The condition is used, the last revision would have been in 08/2024.
Since I gave up diving, the revision was not made.

A revision before diving is recommended!

Price: 150EUR

Shipping is borne by the buyer.

The sale is made under exclusion of any liability for material defects. Liability for damages due to injury to health, body or life and grossly negligent and/or intentional violations of my duties as a seller remains unaffected. Since this is a private sale, a return, exchange or refund is excluded.

Hilter

Sell a Apeks DS4 first stage with an AT 20 controller, 2 bracket and inflator hose.

The condition is used, the last revision would have been in 08/2024.
Since I gave up diving, the revision was not made.

A revision before diving is recommended!

Price: 150EUR

Shipping is borne by the buyer.

The sale is made under exclusion of any liability for material defects. Liability for damages due to injury to health, body or life and grossly negligent and/or intentional violations of my duties as a seller remains unaffected. Since this is a private sale, a return, exchange or refund is excluded.

Hilter

Hello dear diving friends,

I am selling my serviced diving set, which comes fresh from maintenance at taucher-technik.de / Michael Reiter. The tanks have new TÜV and are therefore fully functional, clean and rust-free. A new bridge has been installed and the regulators have been completely checked and maintained. Replaced spare parts are included. Therefore, this set cannot be compared with other sets here, because almost never tested things are sold in classifieds. Please keep this in mind when asking for a price.

For sale is a complete set consisting of:
- Double 10 bottles with new bridge and new TüV
- Apeks Regulator ATX 40 (EN 250) Set incl. Octopus 2nd Stage
- Polar air pressure gauge
- DiveRite harness with knife and additional plates for equipment
- Backplate
- Rec Wing by Dive Rite (tested)
- on the Wing, as shown in the pictures, the drain valve and inflator hose have been replaced! New and unused and tested! The springs are now made of stainless steel.

If you have any questions, please call me.

So why am I selling a set that has received fresh spare parts, TÜV and revision for a lot of money? Unfortunately, the answer is simple: I have two toddlers;) and that's why I decided to sell my equipment first due to lack of time for diving in Hemmoor. But I don't run an untested sh... so you can be sure to get good material that works. I enclose invoices for the revision and the spare parts. Of course, there is no warranty for private sales. I used the set irregularly for 2 years before. Kind regards, Phil

Shipping with a forwarding agent possible, of course I would prefer a visit in 24632 Lentföhrden Schleswig Holstein. But we can also arrange to meet in Hamburg. I would release compressed air during shipping and assume no liability for transport damage, but pack safely and conscientiously.

Hamburg

Hello everyone, I am selling an extensive, well-maintained overall equipment for diving. The set offers a great basis for beginners or occasional divers. From almost new premium components (dive computer, bag) to proven classics, everything is included. The package includes in detail:1. Electronics & transport (as good as new):Mares Quad dive computer: Only 2 years old, condition like new, display scratch-free and fully functional.Mares Cruise Roller: Very light, high quality and almost as good as new dive bag/rolling case. Clothing & ABC (size XL-long / 46):2x wetsuit in size 106 (long size / XL-long): 1x 3mm (with slight signs of use) and 1x 5mm (good condition). Perfect for tall, slim divers!Mares Avanti Quattro fins: The absolute, indestructible classic incl. spare straps. Booties: Fits in size 46.3. Accessories & Safety: High-quality compass (as good as new), diving light, diving knife, signal buoy, flow stick. Optional free of charge with pick-up: 8 kg soft weight (due to the weight no shipping for the weight).4. Classic (fully functional, but due to its age as a handicraft product):Scubapro MK16 regulator with spare pressure gauge (approx. 20 years old).Mares Wingjacket (approx. 18 years old). Both parts worked faithfully until the end. Price for the complete set: 420 EUR (basis for negotiation)Best suited for self-pickup in [Your town] (then incl. weights). Insured shipping is also possible after consultation and against assumption of the (higher) shipping costs for several packages. Important safety note & disclaimer: This offer is a private sale of used equipment. Due to the age of the regulator (approx. 20 years) and jacket (approx. 18 years), these two components are expressly declared to be in need of overhaul, craft goods or spare parts donors. Before the first use in open water, a professional overhaul (service) of these life-support systems must be carried out by an authorized workshop. The use is at your own risk. The sale is made under exclusion of any liability for material defects. Liability for damages due to injury to health, body or life and grossly negligent and/or intentional violations of my duties as a seller remains unaffected.

No returns, no warranty

VB: 450EUR

Potsdam

I offer my complete diving equipment for 850 Euro VB because of giving up my hobby

Last year I was still diving with the equipment in Lake Schwerin. 12 liter diving tank still has TÜV. High quality dive computer Suunto Cobra with quick coupling for removing hose connection. Wet diving suit Aqualung Polaris size 56. Booties size 45/46. Fins from Mares regulator from Spiro / Supra with octopus Spiro / pressure gauge and compass. Seaquest Jacket. Only to be soldas a complete package to self-collectors.

Admannshagen-Bargeshagen

Used, very well-preserved diving logbook. EUR 12,- plus shipping.

Wien

From the previous ownership, CLEAN, WELL-MAINTAINED, WITHOUT SCRATCHES ON THE GLASS AND READY TO USE :-D

All regulators, regulators, dive computers and diving equipment can be mounted on a filled 12 Lt tank and tried out.

Smoke, animal and allergy-free household!

Hai, Moin Moin, Grüß Gott and a wonderful good day I wish:-)

I would like to sell 2x clean and well-maintained Scubapro Crystal VU masks 1x in black and 1x in blue / clear incl. mask boxes for ONLY 59 EUR each for personal pick-up / meeting or plus 6 EUR vers. Shipping in GER. Or both masks for 109 EUR plus 6 EUR vers. Shipping in GER.

Scubapro Crystal Vu Diving Mask

Your Scubapro mask for clear vision and high comfort underwater

Three-glass design with side windows for an extra wide field of vision

Ultra clear tempered glass for brilliant colour rendering and high safety

Double-sealed silicone lip - optimal fit and reliable seal

Soft, supple silicone for long-lasting comfort

Robust, wide mask strap with easy-to-use buckles

Elegant design thanks to exclusive painting process

Suitable for diving and snorkeling

Clear advantages of the Crystal Vu Scubapro : comfort, vision and quality

The Scubapro Crystal Vu diving mask stands out with its well thought-out three-lens design with side viewing windows. The result is an exceptionally wide field of vision that helps you capture the underwater world in its entirety when diving or snorkeling. The Ultra Clear Tempered lens used ensures brilliant colour reproduction and reliably protects your eyes. The double-sealed silicone lip gives you a secure, comfortable fit - even on longer dives. A sturdy, wide mask strap with easily adjustable buckles allows for individual adjustment, while the elegant design ensures a stylish appearance.

What is the best way to fit the Crystal Vu Scubapro diving mask?

The fit of the Crystal Vu convinces with the soft, supple silicone seal. This adapts to different face shapes and ensures a reliable seal - whether you have a narrow, normal or slightly wider face shape. The double silicone lip prevents water from penetrating and ensures a comfortable fit without pressure points.

What are the advantages of the field of vision of the Crystal Vu diving mask?

Thanks to its three-lens design with large front and side windows, the Crystal Vu offers a particularly wide, peripheral field of vision. The large-volume single-lens design allows for almost unrestricted all-round visibility, ideal for divers and snorkelers who value maximum visibility.

What materials is the Crystal Vu Scubapro diving mask made of?

The Crystal Vu is made of high-quality, soft silicone for the mask seal and a robust plastic frame. The lenses are made of ultra clear tempered glass, which ensures safety and brilliant vision. The mask provides clear, distortion-free vision.

What water sports is the Crystal Vu Scubapro suitable for?

The Scubapro Crystal Vu is versatile and is ideal as a diving mask and snorkeling goggles. Their comfortable fit and wide field of vision make them the ideal choice for a wide range of water activities – whether you're a beginner or an experienced diver.

What special features does the Crystal Vu mask and snorkeling goggles offer?

A special feature of the Crystal Vu is the above-average field of vision, including a peripheral viewing angle, thanks to the lenses built into the sides. This makes the mask very popular as snorkeling goggles but also for sunny dives in shallow waters.

How to adjust the mask strap of the Scubapro Crystal Vu?

The wide silicone mask strap is easy and precise to adjust thanks to the side buckles. The Be2x clean and well-maintained Scubapro Crystal VU masks 1x in black and 1x in blue / clear incl. mask boxes is also uncomplicated with gloves.

85221 Dachau

I sell this practical neoprene hood, which is ideal for various water sports activities such as diving or surfing. It offers good protection and keeps the head area pleasantly warm.

- Material: high-quality, flexible neoprene
- Colour: classic black
- Robust seams for long durability
- Fit: snug and comfortable
- Discreet look

The hood is very well made and nestles pleasantly. It is in a neat condition with no visible defects.

If you have any questions, please feel free to send me a message

VHB: 50EUR

83022

I sell this practical neoprene hood, which is ideal for various water sports activities such as diving or surfing. It offers good protection and keeps the head area pleasantly warm.

- Material: high-quality, flexible neoprene
- Colour: classic black
- Robust seams for long durability
- Fit: snug and comfortable
- Discreet look

The hood is very well made and nestles comfortably. It is in a neat condition with no visible defects. If you have any questions, please feel free to send me a message

83022

I'm selling a Mares XR backplate made of 3 mm stainless steel with complete harness — new and never used — for 199 EUR.

I had planned to use the set as a secondary configuration and never got around to diving with it.

This is included:

• Mares XR Backplate, stainless steel, 3 mm (approx. 2.5 kg)
• Complete Mares XR harness, infinitely adjustable
• D-rings at shoulders and hips
• crotch strap with D-ring
• quick-release buckles

Not included: Wing/blade and single tank adapter. The backplate harness system is sold separately.

Condition — honestly: New and never used, but without original packaging and without a receipt. The webbing is without any signs of wear, the plate without scratches — look at the detailed photos, you can immediately see the difference to a dived harness.

Why stainless steel? The 3mm plate weighs around 2.5 kg. This weight sits centrally on the back instead of on the lead belt — this noticeably improves the trim position and relieves pressure on the hips.

New price of the set consisting of backplate and Heavy Duty harness: 299 EUR.

I'm currently selling off my diving gear — Peli transport case, heated gloves, heating battery, and a mounting board are also for sale. Feel free to check out my profile; I offer a package price for multiple items.

Shipping as an insured parcel is possible; the buyer bears the costs. Collection in Munich/Trudering is welcome anytime. Payment: cash, bank transfer, or PayPal — Friends & Family without surcharge; Goods & Services with buyer protection incur an additional 2.49% + EUR0.35 fee.

Private sale – no returns, no exchanges, no warranty or guarantee. The sale is made excluding any liability for material defects.

Price: 450 EUR
MUST GO so that I can quickly get a new one, hence the price.
Offer my drysuit here, as it is a bit too small for me :) it is made of trilaminate from the brand Scubapro , size S. Attached is a size chart, that may help, otherwise I will be happy to send measurements on request. I haven't dipped it for a long time, but it was tight, hanging dark and cool in the cupboard. The cuffs are made of latex and were regularly maintained by me with Vaseline and talcum powder. The zipper was maintained with paraffin wax about every second dive. In total, the drysuit did about 50 dives with me and I was always very satisfied. Just to put on a thick undersuit, I would need an M, not an S. It has two large pockets on the legs, one of which has a little Velcro loosening, but can be easily sewn back on. The socks are made of neoprene, I have shoe size 39/40 and they fit perfectly. The neck cuff would have to be replaced. Ring system is in both the neck and wrists. If you have any questions, feel free to write to me :)
NP: 1,725 EUR (see photo)
Shipping at your own risk, no return or warranty, if you want to try it on, please :)

If you have any questions: Message ma.muecksch@gmail.com or 004915751025180

I hereby offer my beloved jacket for sale.

Unfortunately, I grew out of it... :(

I always took good care of it and cared for it as best I could.

Was bought in December 2024 and has about 50 dives on it.

The i3+ system really simplifies buoyancy control enormously and you can concentrate better on the diving itself. :)

NP: 799,-

VB: 450,-

Reutte

I am selling my new travel jacket OMS IQ Lite CB Signature with Performance Mono Wing in size M-L. I wore it exactly 1 time in the Dive4Life diving tower in Siegburg and unfortunately noticed that it is too big for me when diving (I am 1.69m) Accordingly, the jacket is without signs of use - unfortunately I can not send it back. Of course, it was cleaned and disinfected after the dive.

Invoice from May 2026 is of course included for warranty purposes (556 euros), as well as the inflator hose and two weight bags with quick discharge in addition to the four trim lead pockets.

The Performance Mono Wingbladder has a double-shell design, which ensures increased safety and a long service life. Bladder Size 27 lbs (12.5 kg): Ideal for mono cylinders.

The bladder is equipped with a pleated hose including inflator and quick-release valves at the top and bottom.

Pick-up and fitting possible in Cologne - price 475 VHB.

Köln