Once inside the job got tougher. United Oil’s site security strategy did not emphasize an impenetrable perimeter. Instead, it concentrated security assets in the buildings themselves. Each structure had its own level of countermeasures, the extent and complexity varying according to the value of the contents of the structure and the ease with which an intruder might affect or remove those contents. Dodger was expecting difficulties in slipping past the Intrusion Countermeasures of the target building. They were counting on him to take control of the alarms, but they wouldn’t know if he had succeeded until the moment they tried to enter the building. They had been unable to agree on a form of signal that would not alert United Oil security. Once inside the building, they could communicate relatively safely through the site’s computer system. But by then, Ghost and Sam would have set off any still functional alarms as they crossed the building’s security barrier.