Authorities released a preliminary report on the Air India crash, following an investigation. The London-bound flight from Ahmedabad crashed minutes into the June 12 flight. Only one passenger of the 242 passengers and flight crew survived.

With 260 casualties and only one surviving passenger, the Air India 171 crash is one of the deadliest aviation incidents in recent history — and so far it’s proving to be one of the most frustratingly opaque.

Sumeet Sabharwal, 56, was the captain on the flight, while Clive Kunder, 32, was the co-pilot who was flying the plane. Together, the two pilots had more than 19,000 hours of flight experience - nearly half of it on the Boeing 787. Both had passed all pre-flight health checks before the crash.

The left engine separated from the aircraft and struck the north corner of this building at ground level. The aircraft's right engine was found resting beneath a concrete water tank on the building's rooftop. The tail section of the aircraft was found embedded in the building's northeast wall and was later moved to the ground.

In the wake of last month's deadly Air India crash, an audit into the airline's operations is being conducted. Boeing 787 Flight 171 crashed into a medical college campus and in the city of Ahmedabad,