Tag Archives: rebreather

MC90 mCCR – Dive buddy perspective

This past Tuesday, I dove with Andrew and the new UTD MC90 mCCR.

Since its announcement to the world, it’s caused more than a few amusing posts on Internet forums. The comments ranged from interested, to wait and see, to let’s give the MC90 a chance, to WTF are these guys thinking.

Like any configuration, I assume that it has its plus and minuses. And for what it’s designed for, I bet it meets its needs. Since I don’t do deep expedition in remote locations, I’m not the best judge of success. However, there are a few aspects of the MC90 that I do appreciate:

  • Similar protocols to OC – I like the similarities of handling issues from OOG to rock bottom. I’m sure the consistency is nice for those who dive both rebreathers and OC, but I also like it for the ability to dive in mixed teams. I don’t want to miss a dive because I don’t have a rebreather.
  • Gas extension – Not unique to the MC90, but I’ve always been fascinated by the recycling aspects of rebreathers. Lower gas usage and lower costs (in the long run) are intriguing.
  • Variable P02 set points – Hadn’t thought about this till we spoke about rebreathers on the drive down to Monterey. Current models and decompression schedules are based on changes in pressure and the P02 of the gases breathed at specific depths. The ability to change P02 at any depth opens up a lot of possibilities for decompression diving.


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August 7, 2009 – The Road

AG and I meet up to dive The Road at Pt. Lobos in Carmel. As we roll into Carmel, Monastery welcomes us with mirror flatness.

We dove together on Tuesday, website and visibility was at best 20′. Today, buy information pills we hope for better conditions, receive it.

At the Three Sisters, visibility is easily 40′ if not more. On the Road, it is even better. When I turn the dive at one of the pinnacles, AG can only look at me in disbelief and wave his arms in frustration. The views are amazing – schools of rockfish, light penetrating to 130′, and calm waters.

Well, when he wants to buy me a rebreather, then we can stay out longer. Until then, I have gas limits to adhere to.

Using 1:1 Ratio Deco, our schedule is
70′ 1
60′ 1
50 2
40 3
30 5
20′ 10 min
5 up

AG’s MC90 rebreather dive video with a Panasonic Lumix DMC-ZS3:

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My Pt. Lobos dive video with a Canon A570is

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