The room was SOSUS (sonar surveillance system) Atlantic Control. It was in a fairly nondescript building, uninspired government layer cake, with windowless concrete walls, a large air-conditioning system on a flat roof, and an acronym-coded blue sign on a well-tended but now yellowed lawn. There were armed marines inconspicuously on guard inside the three entrances. In the basement were a pair of Cray-2 supercomputers tended by twenty acolytes, and behind the building was a trio of satellite ground stations, all up- and down-links. The men at the consoles and the computers were linked
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