to kill her, they still have this theory of culpable negligence. >> and we will be talking to you tomorrow as well about this. thank you. the special coverage of flight 370 starts now. >> hello everyone. thanks so much for joining me. it's being called an amazing stroke of luck. the u.s. navy's pinger locater has detected pinger signals consistent with the black box. this first detected a series of pings that lasted approximately two hours and 20 minutes, lost the signal, turned around and again, the pinger picked up another signal. both sounds were different which is what we would expect from two separate pingers. on the flight data reporter and