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VMS RedBare Rebreather...


Training on the VMS RedBare CCR at Vobster equips divers with the skills to add a whole new chapter to their diving.

Vobster offers VMS RedBare training through IANTD, beginning with CCR user, progressing through Normoxic (60m) and Trimix (100m) levels to the 120m Expedition Trimix qualification. CCR user is available with either 42m limit for an air diluent or 48m limit with an ART diluent.
User level training begins with a full unit stripdown and rebuild, identifying all components for gas control, backup systems and monitoring. Diving begins with a gradual orientation of all controls, moving onto breathing loop O2 control via automatic and manual systems.

This foundation is built on with progressive training through different modes of operation, watermanship and buoyancy control until multipart safety skills can be accomplished confidently. The result is a diver who understands the mechanical, electrical and gas blending options on the VMS RedBare and how these systems interlock to provide a world leading level of life support.
Vobster Quay are proud to follow up training on the VMS RedBare CCR with exceptional support services. We encourage new CCR divers to continue to access the benefits of their training with post course mentoring on the VMS RedBare and offer unrivalled support for development and review post course. Support is available by phone or email to assist with CCR learning curve as you take your new skills and unit on new adventures.

Vobster Quay also offers 1:1 CCR coaching at £180 per day for refreshing skills at the start of the season, after an extended break or just to tune everything up.


Once upon a time, only hardened tech divers would even consider a rebreather, mainly to save money on trimix. Now we know that the additional benefits of warm, moist gas, optimised deco, no bubbles, low gas bills and dive flexibility with multiple backups create many more advantages for divers of all levels.

As diving a constant PO2 rebreather means our breathing gas gets richer the shallower we get, we need to understand accelerated deco, so the normal route into CCR diving is to complete Advanced Recreational trimix on open circuit first.

However, more divers are thinking about rebreathers earlier and don't see the need to invest in OC gear, before buying a rebreather. IANTD offers a route for these divers, by allowing them to complete ART and CCR User as a combined course on the rebreather, without any OC dives. This means that as soon as you are a confident AOW diver with a Deep Spec, you could consider a VMS RedBare CCR course with us. A great first step is a VMS RedBare CCR experience day, consisting of unit intro and approx 40 min dive to 12 metres.

Alternatively, some divers benefit from progressing to OC Normoxic and getting a taster of the big dives ahead, before switching to the VMS RedBare CCR and it's benefits for technical diving.

For the very ambitious, IANTD offers a route to begin diving on a CCR at Open Water level - please contact us for details and prices.


At Vobster Quay, we can offer VMS RedBare CCR training to ART diluent level and higher level training (including instructor training) can be arranged through our network of experienced and highly trained instructors throughout the UK and beyond...

IANTD RedBare CCR Instructor
Tim started diving in 1990 while studying Marine Biology and Oceanography, becoming a BSAC Advanced Diver in 1993 and taking part in several scientific diving expeditions to Southern Ireland.

Following an MSc in the Orkneys and an HSE Part IV qualification, Tim worked across the spectrum of diving, including environmental survey work, aquarium diving and media projects.

Eight years of aquarium education programmes has given Tim a deep enthusiasm for revealing the underwater world to divers and non divers alike, even converting an old sewage works in Fort William into a public aquarium based around human marine exploration.

His diving has taken him to many countries, wrecks, reefs and a couple of caves. Although Tim has also occasionally been persuaded to dive in warm water, he is convinced the UK offers some of the best diving in the world.

Tim began technical diving in 1999, taking part in the 990 magazine expedition to the Bullring in 2002 as underwater videographer.


CCR might initially look like the personal equivalent of a moon landing training programme, but at the heart of every rebreather is a very simple process that can be mastered by any competent diver.

Having decided on your diving gas, inhaled it, then exhaled it, it now contains less O2 and more CO2 than it did. Since it is being recycled and 'rebreathed', all we need to do is remove the CO2 and inject some more O2.
First of all, CO2 removal. For this, we need some chemical absorbent and a one way loop to make sure it goes through the absorbent. The one way flow on the VMS RedBare is achieved using delicate valves on the side of the mouthpiece. The absorbent is Sofnalime 797, which is efficient and fairly flood resistant. The process is simple - you breath, the gas goes round the loop and as it does, it spends enough time in contact with the 'sorb' to remove all the CO2. After the sorb a CO2 monitor checks to ensure there is no more CO2 than normal.
Second O2 replenishment. This is a bit trickier - we could end up with too much or too little, neither of which are good. The process goes something like this if we stay at one depth. You breath out - the gas passes through the CO2 absorbent and into a chamber where three O2 cells check the O2 content. If it has dropped, the computer takes this info and fires a solenoid, allowing a little O2 into the loop, before the sorb. This is mixed as it flows through the sorb and then analysed again. If it's still too low, the solenoid fires again, if not it waits until you metabolise some more gas.
Now, let's think about what happens when you descend. Boyles Law says that the volume in the loop will decrease, which means that the next breath in will be hard. This is where a simple valve on the side of the rebreather (just like in a normal second stage) is pulled in, opens a demand valve and our diving gas (not O2) refills the loop. Now we have the volume to breath and the rebreather analyses it to check if any more O2 is required.

Once we get to our chosen depth, the rebreather makes sure our O2 content (PO2) stays at our chosen level. Of course, dropping down again, increases the PO2, possibly to an unsafe level, so buoyancy control is as important as it was on your basic nitrox course!
On ascent, we do need to concentrate. As we ascend towards the surface, two things happen - first the breathing loop expands, creating extra buoyancy. We can vent this through the nose and stop it being a problem.

Secondly, the PO2 within the breathing loop will drop, which means the solenoid will add some more O2 - excellent, this will make our deco more efficient. However, this is also volume, creating some buoyancy, so a bit more venting is needed. One of the key features of training is to get used to this new style of ascent and understanding what happens to our breathing gas.

03-10-2017   10:04



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Stuck for something to on Saturday 4th November? Why join us down at Vobster Quay for our annual celebration of nefarious individuals with pointy moustaches trying to blow up the Houses of Parliament!

We'll be filling the skies above the lake with enough bangs, pops and whistles to scare even the... [more]

POSTED: 11th October 2017

Some great photos from last weeks Glow Swim, thanks Jason.

POSTED: 10th October 2017

Fancy seeing something different in the dark? This Thursday our friends from Linear Guidance Illumination - LGi will be at Vobster Quay Inland Diving Centre demonstrating their illuminated marker systems. Used by the police and the military, as well as many commercial organisations, maybe this is how we should mark out all our routes and features for safer low-light and dark diving conditions? Come along and see what you think! Cheers, Pete

POSTED: 09th October 2017

Outstanding congratulations to an outstanding group of new divers. From right to left, Chris White, Thomas Lumley and Nichola Crabtree have achieved the accolade of Open Water Diver with characteristic style. Jolly good show! Wishing you all the best in your future diving adventures. Many thanks, Hugo

POSTED: 09th October 2017


Look who turned up at Vobster Quay to try out open water swimming! None other than Team GB double Olympic silver medal winning swimmer, Jazz Carlin - check out the news report over at the BBC...


POSTED: 06th October 2017


A massive thank you to everyone that joined us last night for our annual TRIbal Triathlon GLOW Swim event. Set against the pale light of a beautiful full moon, so many of you joined us for this magical annual event! Lots of photos to follow over at the TRIBal Facebook... [more]

POSTED: 06th October 2017

Details for Glow swim tonight.

POSTED: 05th October 2017

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