the.com/hull breach

means A rupture in the outer shell of a spacecraft or vessel that lets pressurized air escape and the vacuum (or sea) rush in, usually very fast and very badly.

from Straightforward compound rather than a hidden story: 'hull' comes from Old English hulu, the husk or pod covering something, which drifted by the 1500s into naming a ship's outer body — the husk that holds the crew in and the elements out. 'Breach' traces to Old English brecan, 'to break,' the same root that gives us 'break' and 'broken.' Put them together and you get exactly what it says: the husk, broken. Older than spaceflight by centuries — sailors feared it long before anyone feared vacuum.