This ruin definitely had plenty of self-defensive mechanisms remaining and AI guard robots. However, they were all level 2 space civilizations' standard, using Gaussian weapons. In terms of technology, they were not better than the Hope, so their attacks were unable to poke through electromagnetic shields, much less plasma shields.
This combined with the Homo Evolutis' affinity for space wars and close-quarters combat, cleaning up these backward mechanisms was a cakewalk.
To prevent the hidden threat from hurting the normal workers, the Black Star Troopers spent the following month combing the ruins until they could say for certain that this ruin didn't contain anymore threats. It was then that the Hope could send in the salvage team.
