an exclusive look inside inmarsat, the british satellite company solely responsible for pinpointing the search. >> reporter: this is inmarsat, the company which for 35 years has been used by ships and planes to keep in touch. we were given exclusive access to the network's operation center. here in the satellite control room in london that you see the technology involved, and you start to understand how they came to the conclusions. the satellite involved is inmarsat 3-f1. one of 11 satellites in the inmarsat collection. it's in stationary orbit just over the indian ocean and it was to this satellite that mh-370 sent the signal, the so-called handshakes. leading the team here was mark