What else do we know could produce multiple system failures? The Unknown Artefact, as it eats through systems.
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Consider exactly how a Capital ship "picks up" a UA......can you imagine cargo scooping with SS1????.......I don't think so.
IF SS1 detoured to get a UA, then the UA must have been in a smaller ship, which docked in the SS1 docking bay.
If the UA had been transferred to SS1, its just possible someone may have noticed the degradation of their systems - and got rid of the thing.
If the UA was still in a smaller ship, in the docking bay - the degradation of the smaller, possibly unmanned ship, may well have gone unnoticed - till the UA ate its way out - degraded (a capital ship docking bay is not sealed from space like a coriolis station) and exploded/warped away. The SS1, which was running late, was trying to warp - oops.....explosion. Yes you could call it a "multiple systems failure" I guess....