Just returned from Bonaire with the rebreather

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tstormdiver

Contributor
Scuba Instructor
Messages
6,193
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Location
Kentucky
# of dives
2500 - 4999
I took my Prism2 to Bonaire with myself last week. Being I carried it on with me, it got a few raised eyebrows from airport security when it went through the X- ray machine, but they didn't delay me at all. I did not get to dive it as much as I would have liked, but I did manage to get 9 dives & an avaerage of 9 hrs on it throughout the week. Out of 6 days of diving I only dove it 4. I was limited mostly because of specialty class requests & working on our shop's customer's equipment from time to time. Not a big deal on m part, I am proud to be of service to & trusted by, our clients.

When I did dive the Prism, I worked on fine tuning my trim & buoyancy. I had it down pretty decent by the end of the 4th day. I was totally blown away by how close the unit allowed me to get to the critters there without spooking them. It was also nice to be able to do the dives without freezing my tuckus off, as I do at the quarry. The only downsides I saw to the rebreathers was,... in a group of OC divers, I was limited to their air supply, but I was accepting of that. The other was the prep & maintenance of the unit every day. I would have to rise early every morning (6am) to get the unit ready, run through the operational checklists & pre- breathe, before the dive day began. OK,... so I'm still a little slow at it,.. but I would rather be a bit slow, than to get in a hurry & make a critical mistake. The more I dive the Prism, the more I understand it & the more cautious I am with it. Only a few more hours left to get before I would be elgible to begin CCR Cave & only 16 more dives until I reach the milestone of 1000 logged dives.
 
How far in advance of splashing are you doing your pre-breathe, and what's occurring with the unit between when you do it and when you splash?
 
Not more than an hour. Usually it is driving to the dive site, dress, get into the water,... or if I'm at the resort, then it is dress, then get into the water. It was too freaking hot & humid to stay out of the water very long. Going from resort to site, to site the rebreather rode in the back seat of the truck vertically. If the surface interval was more than an hour, then I would do another Pre- Breathe before getting in the water.
 
Yeah, my concern would be potential for scrubber settling/channeling during transit between pre-breathe and actual jump. For a properly packed scrubber, there should be zero issues - then again, improper scrubber packing is one of the things the pre-breathe is supposed to catch. 5 minutes of pre-breathe while geared up with a ton of BO hanging off me is my least favorite part of CCR, so I get where you're coming from though.
 
Yipes, and here I've been considering the $$$ for an RMS upgrade just to cut down on pre breathe times :D Guess it could be worse. Though the 10 minute approach makes more sense to me; I've done a 5 minute couch dive without any scrubber in place just to see how it feels, and the only thing I got was a tad light headed from hypoxia…not at all confident a 5 minute pre-breathe is enough to tell me there's a CO2 problem.
 
There are few things I enjoy more than the scrunched-up-face-look the TSA gives me when I put my "jet pack" through their X-ray machine at the airport. I'm almost disappointed when they just let me walk on through.

---------- Post added August 5th, 2014 at 02:02 AM ----------

Not more than an hour. Usually it is driving to the dive site, dress, get into the water,... or if I'm at the resort, then it is dress, then get into the water. It was too freaking hot & humid to stay out of the water very long. Going from resort to site, to site the rebreather rode in the back seat of the truck vertically. If the surface interval was more than an hour, then I would do another Pre- Breathe before getting in the water.

Why not prebreathe on the boat quietly on the way out to the site? I'll pull a negative and calibration on my unit when I pack it, but I breathe it up right before I splash.

---------- Post added August 5th, 2014 at 02:05 AM ----------

Yipes, and here I've been considering the $$$ for an RMS upgrade just to cut down on pre breathe times :D

What's the rush? And, really? A $3500 upgrade to shave 3 minutes of breathing off? I mean, no one around here is more likely to make the "time is money" argument than I am, but that's edging on extreme ;-)
 
Why not prebreathe on the boat quietly on the way out to the site? I'll pull a negative and calibration on my unit when I pack it, but I breathe it up right before I splash.


Because all of our dives were shore dives & pre- breathing while driving a manual transmission truck (I was one of the few of our group that could drive the trucks) would probably be a tad difficult, if not even dangerous:D. I was part of a large group of all OC divers. For them to have to wait for me to pre- breathe in the hot sun (not much shade in Bonaire),.. would not have made me very popular. I tried my best to set things up before we left the resort & as close to splash- in as I could to minimize delays.
 
Because all of our dives were shore dives & pre- breathing while driving a manual transmission truck (I was one of the few of our group that could drive the trucks) would probably be a tad difficult, if not even dangerous:D. I was part of a large group of all OC divers. For them to have to wait for me to pre- breathe in the hot sun (not much shade in Bonaire),.. would not have made me very popular. I tried my best to set things up before we left the resort & as close to splash- in as I could to minimize delays.

Solid reasoning :-)
 
What's the rush? And, really? A $3500 upgrade to shave 3 minutes of breathing off? I mean, no one around here is more likely to make the "time is money" argument than I am, but that's edging on extreme ;-)

Meh. In seriousness my main reasons for the upgrade would be real-time monitoring of the reaction front, extended runtimes here in HI where DPV + long deco + warm water = huge efficiency increase vs the obscene cost of good sorb, and replacing my hardwired Predator with a wet-connnect Petrel...but shaving a few minutes off that miserable time while I'm stuck hunched over at the edge of a cramped little dive boat with a bunch of 80s hanging off me...is not a valueless thing.
 

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