An 18-inch shell passes through a destroyer in the simulated action, entering one side and leaving the other. The first hit causes damage judged sufficient to sink a real destroyer, although the simulated ship remains afloat. A later hit on another destroyer disables all three engines and the steering. Overpenetration therefore offers little reassurance when a projectile this large strikes a destroyer.
Notable Point · 3:39:49-3:41:00
Why overpenetration does not make an 18-inch hit harmless
An 18-inch shell can pass through a destroyer and still cause severe damage, including the loss of propulsion and steering in the simulated action.