S1, E2: The team pursues various leads while they wait to see if Madelyn Strong, the surviving witness of Flight 716, will regain consciousness. Theo examines the possibility of mechanical failure – the plane was part of a new fleet of aircraft, perhaps a critical weakness was missed in the rush to launch? While her colleagues investigate different theories of the case, marine expert Nadia pinpoints 716’s final resting place on the ocean floor, calling in the Royal Navy to recover the black boxes in a daring and time-sensitive mission.