Why USS Olympia needs expensive underwater preservation

Why is the protected cruiser Olympia reported to be in poor condition below the waterline?

Without a personal inspection, the suggested causes are age, a need for dry-docking and repainting, and possible funding shortages; replacement plating may be needed.

The answer explicitly lacks a personal inspection of Olympia. Dry-docking, repainting and age-related deterioration are suggested as likely explanations for the reported condition below the waterline. Reconditioning might require replacement hull plates. Limited museum-ship funding is another possible contributor, rather than a confirmed diagnosis of this vessel.