What Barry considered a "misjudgment" at Livingston Observatory was, of course, mistaken. In fact, it was not only Livingston that had detected it, Hanford Observatory and Italy's VIRGIN Observatory had all detected the presence of GW180509.
Although GW180509 was low-powered, it was too close, and gravitational waves spread without a dead angle. The frequency was also right at the upper limit of the entire LIGO System.
However, almost 5 minutes after the transmission of GW180509, "Mountain and Sea" completely invaded these advanced observatories. They managed to erase traces of GW180509's existence before the staff there could notice the anomaly.
It was only because of partial upgrades to the computer system at Livingston Observatory, which physically isolated the feasibility of the invasion, that a leak occurred.
Although "Mountain and Sea" still managed to delay the time, they could not avoid the leakage. Now they could only decide on the next steps through close surveillance.
