i will say that the theory between rebreather and torch is opposite. when in water, the air pressure of the rebreather if higher than water, but the torch's is smaller. so the situation will be that the air of the rebreather can leak out of the container, but the air of the torch can't leak out of the torch, it will just suck the water in by the different pressure.
all air and liquid meterials can only flow from high pressure place to low pressure place, the opposite route is impossible.
there is other diver suspecous that use the same thing some days ago, he give the sample of his air bottle. so i think that you are a diving payer that just interesting in the landscape but not about the gear. is that right?
by the same time, i am sorry for the bad English and i will try to write the most accurate meanings and syntex.
eagle Z