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I am working on a product design which would be used sub sea. It is designed to lift a small load off the sea bed. I have not worked out the exact details yet but the following should be a good start:

Load 30Kg

Depth 30m

I plan on using an air bag of some description - the bag needs to auto inflate though as there will not be a diver there to operate. This is the circuit/design I am working on at the moment.

What I need to figure out is, how much air (or CO2) is required to lift a load of 30kg from 30m depth?

Can anybody point me in the direction of the calculations for this?

Thanks