As to what could have been done in the old days with an automatic mixture rebreather with no decompression meter facility: it could also be asked: "how did people ever dive with aqualungs, in the old days before decompression meters"? People used dive tables. With automatic mixture rebreathers available and no dive computer yet invented or even thought of: some body or club would have provided special decompression tables, and automatic mixture rebreathers would have been very useful, if only the #@$% Navy's frogman department hadn't hoarded the design secret like it was an atom bomb. Modern divers have got so computer dependent that it seems to need a hard mental wrench to think of life without dive computers. I started diving in 1965, and I remember over 20 years without dive computers, and even a time when divers' inflatable lifejackets were unheard of, and when all aqualung divers used regulators with wide hoses like in old pictures of Cousteau and Hans Hass. I started diving only a bit too late to see the time when British divers made their own regulators!
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