Investigators have recovered the cockpit voice recorder (CVR) from the crashed Air India flight, a key step in uncovering what caused last week's deadly accident.

The black boxes will provide cockpit conversations and data related to the plane's engine and control settings to investigators and help them in determining the cause of the crash.

Air India Boeing 787 flight to London was canceled just days after the crash on June 12 that took the lives of over 290 people. Air India said the cancellation was due to "unavailability of the aircraft.