The impetus for the creation of a coordinated observing system to provide baseline data and ensure sustained monitoring came from IOC in the late 1980s and resulted in the creating of the Global Ocean Observing System (GOOS) in 1991.
Kind of how you'd install an operating system, automatically receive some baseline functionality using least-common-denominator hardware drivers, then install specialized drivers for your machine's video, sound, and network cards?
Their system then measures changes from the baseline voice that signify an increase in stress, excitement, anticipation, hesitation or other emotions that can indicate a potential terrorism threat.