At 0645 hours, Box 29-04 sent Engine companies 29, 37, 23, 25, Trucks 29, 23, Rescues 29, 30, and RIT 33 to across from 411 S. High Street for a building fire. Chief 8 (Neff) went enroute and was advised by Headquarters of possible entrapment. Chief 8 arrived shortly after with heavy smoke showing from 2.5 story, 40 x 70, wood frame, occupied, multiple dwelling. Mechanicsburg Engine 1-29 arrived as the first due engine company and a line was stretched to the rear. Command 8 requested the second alarm at 0651 hours, bringing Engine companies 12, 31, 14, Truck 30, and Air 13 to the scene. Once occupant was located and removed from the building in an unresponsive condition and transported to a local hospital. The bulk of the fire was knocked down in 10 minutes with no further extension to the building.