As civilizations at the top, Xyrin and Star Domain both have their own research and response systems for the Abyss, not just to combat the various disasters generated by the Abyss, but also to analyze the Abyss itself: crossing the Gate of Abyss.
The Deep Dive Project from the Old Empire Era was not the first project to cross the gate, it was merely the farthest and most insane one. Before the Deep Dive Project, the Old Empire had already sent probes and unmanned outposts to the Gate of Abyss, and there were a few "Crossing Gate" projects involving personnel. However, the data from those projects are now missing, and we still don't know how the Old Empire managed to safely conduct tasks beyond the Abyss Gate—it's possible all similar projects failed. In short, the records from that time are now inaccessible.
