McMahon's version of an anti-WANK program was also ready to go by late Monday, but he would face delays getting it out to NASA. Working inside NASA was a balancing act, a delicate ballet demanding exquisite choreography between getting the job done, following official procedures and avoiding steps which might tread on senior bureaucrats' toes. It was several days before NASA's anti-WANK program was officially released. DOE was not without its share of problems in launching the anti-WANK program and advisory across HEPNET. At 5.04 p.m. Pacific Coast Time on 17 October, as Oberman put the final touches on the last paragraph of his final report on the worm, the floor beneath his feet began to shake. The building was trembling. Kevin Oberman was in the middle of the 1989 San Francisco earthquake. Measuring 7.1 on the Richter scale, the Loma Prieta earthquake ripped through the greater San Francisco area with savage speed. Inside the computer lab, Oberman braced himself for the worst. Once the shaking stopped and he ascertained the computer centre was still standing, he sat back down at his terminal. With the PA blaring warnings for all non-essential personnel to leave the building immediately, Oberman rushed off the last sentence of the report. He paused and then added a postscript saying that if the paragraph didn't make sense, it was because he was a little rattled by the large earthquake which had just hit Lawrence Livermore Labs. He pressed the key, sent out his final anti-WANK report and fled the building. Back on the east coast, the SPAN office continued to help people calling from NASA sites which had been hit. The list of sites which had reported worm-related problems grew steadily during the week. Official estimates on the scope of the WANK worm attack were vague, but trade journals such as Network World and Computerworld quoted the space agency as suffering only a small number of successful worm invasions, perhaps 60 VMS-based computers. SPAN security manager Ron Tencati estimated only 20 successful worm penetrations in the NASA part of SPAN's network, but another internal estimate put the figure much higher: 250 to 300 machines. Each of those computers might have had 100 or more users. Figures were sketchy, but virtually everyone on the network--all 270000 computer accounts--had been affected by the worm, either because their part of the network had been pulled off-line or because their machines had been harassed by the WANK worm as it tried again and again to login from an infected machine. By the end of the worm attack, the SPAN office had accumulated a list of affected sites which ran over two columns on several computer screens. Each of them had lodged some form of complaint about the worm.