Abstract: Array of acoustic infrasonic transmitters are deployed around an area of target interest and continuously transmit acoustic time marked signals. An unintentional transduction of these acoustic time mark signals is made by a person of nefarious intent, and the resultant live or recorded signal is delivered to the receiver. In the case of many terrorist recordings the transduction is a handheld VTR recording of some political speech or event and the recording of that event is made available thought videotapes delivered to local media. The transduction is analyzed for acoustic time mark signals, which when processed using reverse TDOA methods provides the location of the signal transduction.