User blog comment:Stabber ApSig/Mass Relays Gone, ME3 ending/@comment-227314-20120312032902/@comment-2.97.160.13-20120313043804

The humans built the Crucible in a few months using limited Prothean blueprints. I think, with hundreds of Reapers and the fragments of more than ten Mass Relays, they could deduce how to rebuild the relays. It would probably require extremely hazardous FTL jumps with lots of drift into the systems, but it's likely doable. Even moreso in the Synthesis ending.