How navies would exploit an ice-loading treaty allowance

What would happen if naval treaties allowed extra displacement for ships expected to carry Arctic ice?

Britain and Japan would probably claim Arctic requirements, and the United States could cite Alaska. Italy's search for a polar justification is treated humorously.

Britain would be expected to claim that its ships needed margins for Arctic service, with Japan likely following and the United States pointing to Alaska. Italy's search for an Arctic or Antarctic justification is a joking extension of the scenario. The hypothetical exception gives treaty navies an incentive to claim operating requirements that qualify them for extra displacement.