Abstract: An electromechanical device is disclosed, referred to herein as a “detector arm”. It is useful for locating humans, either living or dead, who are trapped in a structure such as a building that collapsed or was badly damaged in an earthquake, mudslide, bombing, or other disaster. This device includes an extendible mechanical arm which is equipped with a gas inlet device, a miniature video lens and light source, and preferably at least one microphone, all mounted at or near the “distal” end or tip of the detector arm. Various wires, cables, and a gas inlet hose are tied to or otherwise supported by the detector arm, allowing the wires and hose to be coupled to supporting devices, such as a video display, audio amplifier, and multi-component gas detector. The supporting devices can be affixed to the handle of the detector arm, or they can be carried (along with a battery pack) in pouches or pockets in a harness, vest, or similar device worn by the person carrying the detector arm.