Remember that at pressure you don't actually need haemoglobin to transport oxygen to the cells so your not relying on just gaesous transport into the ear.
Gingernut you slowly compress the person in the chamber while they breath 100% O2. They then sit there for a bit and then the chamber gets the pressure let off at a comfy rate.
If say you were blown down to 50m you would have a 5 fold increase in the volume of gas in the ear on the way up. Usually just a doubling from 10m to 0 is more than enough for the ears to creak and all the muck to dribble into your throat. We are talking diving masks full to the brim with snot. One bloke even had a lump of lint come out and he had his sinuses scrapped or what ever you do to them 6 years before then.
It was just an ex engineers suggested solution to the problem.
Mac I don't know about exspense I recon a 2 week holiday to the maldives diving 3 times a day should cost less than a course of hyperbaric treament.
Fancy operating at 600meters depth
