View Omega 4 Relay Mass Effect 2 US. Walkthroughs, build guides, choices, endings, weapons, armor, companions and database of everything you need to know. You'll get the last squad member while on the mission to get the reaper i.f.f.
The only ones to pass freely back and forth through the relay are the mysterious collectors.
Then yes, you are past the event. Over the last thousand years, many ships have attempted to pass through it, but none have returned. This is quite a large blueprint, about 160 meters in length. The omega 4 relay is surrounded by hazard beacons and automated warnings.