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Thanks, that explains why they weren't wearing more rigorous "clean room" gear.
This is in general not all that 'clean' as you point out. This is because the SNO Acrylic vessel at the time the video was made, had been sat open to mine air for a few years. Thus sending people into it it wouldn't really matter so much what they are wearing because it is already fairly dirty.
Thanks, I probably could have guessed that answer but that's just the simplified version for those of us who don't know enough of the technical stuff.
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