SAR Staff, the SVU, TMFPD, and WCSO Deputies responded to a mountain top repeater site on Peavine on the report of two subjects inside a building, behind a locked door, that were not responding to phone calls or knocking on the door. Once entry was made to the site, the subjects were discovered, deceased. Carbon monoxide levels were extremely high in the building, possibly due to a malfunctioning venting system.