They've never been repaired or salvaged cos they're haunted. the southern one, it's kind of benign. You try and fix it, and shit just keeps breaking. As for salvaging it, not cost effective, the stuff in there's been outdated for hundreds of years. Besides, no point anymore, really. the equatorial colonies and high-atmosphere centers are just fine, no need for the polar space anymore.
The northern one, though, now that's a different story. They say that, in the war, the southern colony was taken out just by accident, more or less. Fleet battle swept around it, no one was really aiming at it, but, hey, you miss with just about anything out there and it keeps going. The northern one, that was boarded, supposedly by these vicious shock troops. Murder, rape, the whole dirty ball of wax. then, when it was all done, they opted to jam open the cargo lock doors and let the air all out. Musta set off more than a few scuttling charges too, given the damage.
On that one, though, you try and repair it, and not only does shit keep breaking, but it breaks in catastrophic, wrong ways. Down south, a fusion torch'll just go out. Up north? it'll go nova, and fry some people. There've been 14 misjumps for tugs- only 2 have ever re-emerged, and one of those is the infamous crimson horror. Salvage teams that DO make it report the interior of the dead colony is... wrong. Hallucinations, half-glimpsed shadows, the works.
Take it from me, sonny, don't send a crew there. You'll just end up losing them"