The distinction between a battlecruiser and a battleship continues inside the hull. Battleships have much denser, honeycomb-like subdivision, while battlecruisers retain more open cruiser-style internal spaces. Fewer internal divisions reduce structural weight and displacement. That saving improves the power-to-weight ratio and helps the ship achieve the speed demanded by its role. The tradeoff is less compartmentation available to contain flooding or other damage, so outwardly similar capital ships can have meaningfully different survivability.
Notable Point · 8:21-9:11
Battlecruiser subdivision trades survivability for speed
Cruiser-style internal subdivision saves hull weight and improves power-to-weight ratio, but it gives a battlecruiser less damage-limiting compartmentation than a battleship.