Yes, I didn't know much about the design of the M6 but if that sheath is filled with an inert gas and sealed, scuba would be a pretty stupid idea. Using the inert gas, seems to be a pretty bad idea on first glance though; what do you do with a person who likes to climb mountains? The pressure differentials are lower than what you'd see with scuba but you'd lead to sheath bulges that could press on the cord. Might they have filled it with liquid instead?
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Laura - L5S1 Charitee
C5/6 and 6/7 Prodisc C
Facet problems L4-S1
General joint hypermobility
Jim - C4/5, C5/6, L4/5 disk bulges and facet damage, L4/5 disk tears, currently using regenerative medicine to address
"There are many Annapurnas in the lives of men" Maurice Herzog
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