Naval Historywith Dr. Alex

Q&A · 2:11:12-2:12:02

What it means to break a steel warship's back

Breaking a steel ship's back means damaging its main longitudinal structure until hull stresses and water pressure can force the vessel to bend or fail.

HMS BelfastNaval ArchitectureShip DamageUnderwater Explosions
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Question

What does it mean to break the back of a steel warship, and how does that differ from breaking a wooden keel?

Short answer

It means critically damaging the main longitudinal hull structure so that external pressure and the ship's own weight can bend or break the vessel.

Notes

The expression remains literal even after wooden keels gave way to steel hull structures. A sufficiently violent explosion can damage the principal keel and longitudinal beams that hold the ship together. Water pressure and the vessel's own weight may then bend or separate the weakened hull. HMS Belfast provides the example: mine damage twisted her structure, but the cruiser remained intact rather than suffering complete structural failure.