On "plain O2"?
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For the BH, I like to do a tri mix of 21% oxygen, 78% nitrogen and 1% whatever.
I'm surprised Matt and Morag are gone already. They didn't even last two years. When I was there summer before last, they'd been on the job for only a couple of months and Matt was telling me that this was his dream job. Oh, well.
For whatever reason(s), TIR chews through managers. The staff told me that a few years ago, a married couple arrived on a Saturday to be the new assistant managers. By Wednesday, they had been fired and were back on the boat to the mainland! Reportedly, they had sold all their earthly possessions when they had taken the job and weren't too happy about returning to... nothing.
The Belizean staff, on the other hand, most of them have been there for many years.