Five lost warships that would tell distinct naval stories

Which five lost warships would be most valuable to preserve?

Nagato, Warspite, Illustrious, Saratoga, and HMS Nubian as a representative Tribal-class destroyer.

The answer selects Nagato, Warspite, Illustrious, Saratoga, and HMS Nubian as a representative British Tribal-class destroyer. It explains Nagato as a material record of Japan's post-First-World-War confidence and capital-ship development before the country's later political descent. The wider list deliberately preserves different national experiences and ship types rather than five variations on one famous battleship.