Hollis Explorer

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wedivebc

CCR Instructor Trainer
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Scuba Instructor
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Those of you who know me may know I have been an avid rebreather diver and instructor for a number of years now. I became interested in rebreathers to further my adventures in caves, deep wrecks and basically technical diving beyond where OC could take me. I only mention that because when talked started a couple of years ago about "recreational" rebreathers I really wanted to hate the idea right out of the gate. I have since warmed to the idea of small simple lightweight rebreather and have trained on a couple of real contenders in that market. Namely the ISC Pathfinder and the Posiedon MK VI I was still jaded on the idea of simplified training as I could not see what you could take away from the class that was not nessesary as rebreather diving is just as unforgiving in the hands of a sport diver as they are with a tech diver.
I was recently given the privilege to be the first non Hollis member to test dive a Hollis Explorer prototype. It is an electronically controlled SCR semi closed rebreather that uses nitrox mixtures up to 40% and is rated to 130ft. I was able to comfortably dive this unit to a depth just over 100ft and I was able to stay down for over 90 minutes. During the surface interval a quick scrubber repack and a top off of nitrox and I was good to go for another 90 minutes. The instructor Matt Addison gave me no instruction on the unit other than said see if you can figure it out and watched me while I assembled and pre-dived the unit. That in itself took me about 20 minutes the first time and about half that time after.
If ever there was a truly recreational rebreather that could one day replace open circuit for scuba diving I believe this machine is well on the way to making that a reality. Like I said I was very skeptical about the whole recreational rebreather concept but if this is the direction mainstream diving is going I am starting to be a believer.
 
Really Really Exited about this little guy. Now if only we can get Nitrox on the island...

Something I have been wondering with this guy is do you set the Nitrox for you Max depth? I know It is rated to 130 but you would certainly not want to switch to 40% O2 on OC if you had a problem at that depth.

As a non rebreather Diver I can't wait to have the opportunity to try one myself.

Thanks for the post.
 
wedivebc / Dave,

Thanks for the report. The more I hear about this thing, the more it seems to be "the answer". Please post more info, should have any :)
 
Really Really Exited about this little guy. Now if only we can get Nitrox on the island...

Something I have been wondering with this guy is do you set the Nitrox for you Max depth? I know It is rated to 130 but you would certainly not want to switch to 40% O2 on OC if you had a problem at that depth.

As a non rebreather Diver I can't wait to have the opportunity to try one myself.

Thanks for the post.

You are correct that the depth is limited by the MOD of the gas you are diving and it would be unwise to go below that depth for the reason you mentioned, if you bail out to onboard gas you are exposed to the oxygen PPO2 of that gas at that depth . I would expect the training agencies would want the planned po2 for the maximum depth to 1.6 as the actual gas in the loop will be a few points below that and since you would be making an immediate ascent in the event of a bailout a short term exposure to 1.6 is considered reasonable. The leaner the gas mixture of course the shorter the duration of the dive but I believe a 32% at 130ft would give you more than enough time for most recreational divers.
 
Hollis Explorer Audio Podcast with Phil and Jill

Here's a link to a podcast with Phil Short and Jill Heinerth discussing the Hollis Explorer after a day of shooting the training video for the unit.

IMG_7861l.jpg

Rebreather Pro: Audio Podcast: Hollis Explorer Sport Rebreather with Christian Clark, Phil Short and Jill Heinerth
 
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Just want to add I got to see the unit in action this weekend while I was doing prism training. The unit is rather amazing in its simplicity. It literally was a 5 minute setup time. One thing I want to mention is that per my instructor, this is a recreational unit and not designed for deco. In his own words "if you use this unit for deco diving make sure you have DAN, Dive Assure, and life insurance because you're going o use them"

Daru
 
Seems like its worlds apart from the "bottom time extender" that the GEM was.
 
I just don't see people getting excited about the pre-packed scrubber. The last I looked, those things cost about $30 apiece; divers around here complain about paying $12 for a Nitrox fill.
 
I can see photo bugs, deep divers and spear fishers using this rig. For those types the explorer fits well with. But for the average diver I still think the price to play is too high.
 
I just don't see people getting excited about the pre-packed scrubber. The last I looked, those things cost about $30 apiece; divers around here complain about paying $12 for a Nitrox fill.
Where are you getting prepacked scrubber from what I posted? It uses loose sofnolime not prepacked.
 
https://www.shearwater.com/products/perdix-ai/

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