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A sub-micron fracture was a minuscule fracture that could be caused by neutron fatigue.
A sub-micron fracture in the metal casing of a dilithium chamber hatch replaced at Earth Station McKinley in 2367 was the cause for an explosion in the USS Enterprise-D's dilithium chamber, and not sabotage by the Klingon spy J'Dan, as was originally suspected. The fractures were detected by means of microtomographic analysis. (TNG: "The Drumhead")