Note that on the HOG regs it's the TDI nitrox class that qualifies. The SDI, PADI, SEI, etc classes do not. I'm a HOG reg tech instructor and wrote the procedure for the D3 first stage rebuild. Just in case anyone wonders where my info comes from.
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I'm sure he meant Celsius. You'd need an ice pick to dive in 8-20F water. I think the coldest seawater can get before freezing is about 28-29F.
ps. it was celsius