The uncertain arrival of hollow propeller shafts

What was the first capital ship fitted with hollow propeller shafts?

The panel cannot identify one securely; British interwar ships such as Nelson and Rodney are plausible, but documentary proof is lacking.

Hollow shafts can improve strength-to-weight performance, reduce weight, and help damp vibration, while controllable-pitch propellers require a hollow shaft for their mechanism. The exact first capital ship remains uncertain because technical details were not always public. Nelson and Rodney are raised as plausible early candidates because their designers pursued aggressive weight savings, but the answer carefully stops short of claiming proof.