we lost everything. >> reporter: crash investigators say the copilot had learned he was being demoted and took control of the plane when the captain stepped out of the cockpit, sending it into a nose dive toward the ocean. the cockpit voice recorder revealed the copilot repeated "i rely on god" 11 times just before the crash. the captain can be heard on the recorder saying "what's happening?" even more chilling, the last words heard are the captain saying "pull with me" as he struggled to get his plane to change course. in that instant the copilot turns off the engine, sending the aircraft slamming into the sea. all 217 people on board were killed. >> with egyptair, the transponder stopped working and there was no may day call. the ntsb ruled the copilot intentionally crashed the plane, though egyptian authorities still say it was a mechanical failure.