Sagging (Naval)

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Diagram of ship hull (1) Sagging and (2) Hogging under loads. Bending is exaggerated for demonstration purposes.
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Diagram of ship hull (1) Sagging and (2) Hogging under loads. Bending is exaggerated for demonstration purposes.

Sagging is the stress a ship's hull or keel is placed under when a wave is the same length as the ship and the ship is in the trough of two waves. This causes the middle of the ship to bend down slightly, and depending of the level of bend, may cause the hull to snap or crack. This may have been what sank the Prestige off Spain on 19 November 2002.

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