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Im was an 8 yr commercial Diver in the Gulf who broke his neck and back last year. I'm now a patient and grower and somewhat of a mad scientist. Last year I built a School bus into an RV that ran on Waste Cooking oil that I collected from behind restaurants and drove across the country in it...

One atmosphere is where we are now 14.7psi. , 2 atmospheres is the equal to 33 feet of seawater. the biggest change in atmospheric pressure is in the first 33ft of seawater. I don't know what you're talking about dry ice for, you can pressurize a chamber with an air compressor. The chamber...