Unvented water tank cylinder leaking underneath

I have an unvented water cylinder. It looks like it’s leaking underneath. There is water slowly seeping out from around the base. I can’t find any leaks around pipework or connections. Please see photos.



Is it likely to be the metal outer skin that has rusted or is there some inner skin that goes?



Is my only option to pull out the tank and have a look underneath?

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