Investigators in India have recovered the second black box from the Air India Boeing 787 that crashed in Ahmedabad last Thursday, killing at least 279 people, authorities confirmed on Sunday.

The cockpit voice recorder, CVR, which captures conversations and sounds from the flight deck, was retrieved by search teams, according to PK Mishra, a senior aide to Prime Minister Narendra Modi.

The flight data recorder, FDR, which contains detailed technical data on the aircraft’s performance, was recovered a day after the crash.

The London-bound flight went down shortly after takeoff, slamming into a residential area in the city of Ahmedabad.

Among the 242 passengers and crew on board, only one passenger survived. Authorities also reported at least 38 fatalities on the ground due to the impact.

“The AAIB has launched a detailed investigation, and the US National Transportation Safety Board (NTSB) is conducting a parallel probe under international protocols since the aircraft is American-made,” Mishra said.

“Officials confirmed that the Flight Data Recorder, FDR, and Cockpit Voice Recorder, CVR, have been located and secured.”