The Typhoon figures distinguish about 48,000 tons submerged from 23,200 tons surfaced. Comparing displacement requires specifying that condition. Its description as a boat preserves a category established when submarines were much smaller. A 280-ton corvette still counts as a ship, so modern size does not consistently determine which inherited term a navy uses.
Notable Point · 3:30:31-3:31:05
Typhoon displacement depends on whether the submarine is surfaced
Typhoon's quoted 48,000-ton displacement is submerged; its surfaced figure is 23,200 tons, while the name boat survives from smaller submarines.