Buoyancy force comparison: helium vs oxygen vs hydrogen underwater

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blueshifter
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I have an under water application where I need the maximum amount
of buoyancy with a limit to the volume i can use for a lifting device.
My question is how much more Newtons would be exerted for helium instead of oxygen, or hydrogen instead of oxygen underwater?
What is the percentage increase ?

Thanks in advance
 

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Welcome to PF. On this site, we try to help people learn to learn, rather than just spoon feeding answers. What have you tried so far in figuring this out? Hint: what are the densities of those gases (relative and under pressure)? What is the density of water?