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    To anyone that might know, 
        I have a 500 
gallon propane tank with a .312 thousands thickness and was wondering if that 
might be able to stand pressure of 75 feet or so, I know that some are not keen 
on using one but I really want to build a sub but do not have some of the 
resources that some might have. Also, I was wondering how to make a depth 
gauge.
        Thank you, 
Mike