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Rebreather Hollis Prism 2

The closed circuit market is one of the most rapidly developing branches when we talk about diving equipment. Recently, many new units have appeared, which have an extremely unique design and whose creators draw attention to the undoubted advantages of their devices. One of the most interesting rebreathers available on the market is certainly the
Published: July 31, 2020 - 12:35
Updated: July 22, 2023 - 20:32
Rebreather Hollis Prism 2

The closed circuit market is one of the most rapidly developing branches when we talk about diving equipment. Recently, many new units have appeared, which have an extremely unique design and whose creators draw attention to the undoubted advantages of their devices. One of the most interesting rebreathers available on the market is certainly the Hollis Prism 2.

The world is moving forward at a tremendous pace, and the technology of yesterday, today is already heavily outdated. So it should come as no surprise that the manufacturers of diving equipment are constantly working on new solutions with which they want to conquer the market. It is no different in the case of closed circuits, which in recent years have experienced a real boom.

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rebreather Hollis Prism 2 presentation
Photo: Hollis

As these devices are relatively expensive, the developers have to work hard to convince customers to choose their unit, and the equipment they create must guarantee a high level of security, combined with the best possible performance and, of course, low weight. And this is still just the tip of the iceberg.

Diver with Hollis Prism 2 rebreather
Maxwel Hohn brand ambassador for Hollis photo by Joe Platko

The Hollis Prism 2 is a CCR-type unit, which will prove useful in the exploration of open waters, flooded caves, as well as wrecks. Taking a closer look at it, there is no denying that the creators focused on versatility, or rather the possibility of personalisation for each diver’s own preferences.

Thus, the device enables operation in eCCR and mCCR modes, which will certainly make many potential users look in its direction with a kinder eye, because, as we know, each of these solutions has its pros and cons. Additionally, the anti-lung can be mounted at the back or at the front.

Hollis Prism 2 rebreather divers24.pl
Photo: Hollis

It is worth noting – and this is a feature that Hollis representatives particularly expose – the radial scrubber, which features the best possible protection time, isolation and breathing resistance. It is interesting that the container for the scrubber is made of transparent Engineered Thermoplastic, which makes it possible to see if this part of our unit has been prepared correctly.

Hollis Prism 2 CCR DSV divers24.pl
Photo: Hollis

The Hollis engineering team, in creating this model, has placed a premium on customisability. The various variants mentioned above is one thing, but another, and perhaps the most important in this aspect, is the fact that in order to purchase the Prism 2, we can use the Hollis Prism 2 Builder section, found on the manufacturer’s website. Here we can specify in every detail how our rebreather should be configured and what elements it should consist of.

HUD Hollis Prism 2 CCR divers24.co.uk
Photo: Hollis

A detail that is not insignificant to many is the fact that the Prism 2 is CE certified and can therefore be marketed in EU markets.

Partial specification:

  • Industry-leading WOB – 1.57 J/L at 40 metres using AIR as a diluent
  • Unit weight when fully charged in standard configuration – approx. 22 kg
  • Divided anti-lung allows easy breathing during heavy exertion
  • Anti-lung drains/drains facilitate water removal during diving
  • Automatic ADV valve adds diluent during immersion or when loop pressure is lower than ambient pressure
  • MAV manual valve adds diluent or is used to flush the loop
  • Gases – Air, Trimix and Heliox
  • MAV manual oxygen addition valve allows manual control of PPO2
  • Basic HUD display at eye level for easy monitoring
  • Provides PPO2 parameters for each oxygen sensor
  • External power switch
  • Continuous PPO2 monitoring
  • CNS tracking based on real-time oxygen exposure
  • Scrubber Flow Design – Radial
  • O2 sensors -3 galvanic
  • Large readable Handset Shearwater Petrel

Scrubber operating time in accordance with EN 14143:

  • 190 min (0.5%, SEV CO2) using 8-12 @ 40 ° F / 4 ° C, 3.0 l / min CO2, 18 fsw / 6 msw
  • 190 min (0.5%, SEV CO2) at 8-12 @ 40 ° F / 4 ° C, 1.6 l / min CO2, 131 fsw / 40 msw
  • 215 min (0.5%, SEV CO2) at 8-12 @ 40 ° F / 4 ° C, 1.6 l / min CO2, 330 fsw / 100 msw

Dimensions:

  • Length: 53.3 cm
  • Width: 43.2 cm
  • Depth: 22.9 cm
  • Weight – approx. 22 kg
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About author

Marcin Pawełczyk
Marcin’s journey with diving has been an adventure. Starting as a recreational diver, he soon found himself drawn to the fascinating stories and mysteries of Baltic wrecks. After gaining experience, Marcin decided to go beyond just leisurely exploration and took his training up a notch by completing the TMX course, allowing him to explore even deeper and uncover the secrets of inaccessible places. His next challenge has been cave diving, where he is honing his skills to become a certified diver. Not content to simply take in the breathtaking beauty of underwater life, Marcin has also embraced underwater photography since 2018, capturing stunning shots that bring these worlds alive for those who are unable to experience them first-hand. Marcin’s passion for the underwater has taken him far and is sure to continue doing so as he dives into new depths and captures breathtaking images.
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