Investigators are preparing to study the pilots’ last words for clues as to the cause of last week’s Air India plane crash after recovering the cockpit voice recorder from the wreckage. The voice recorder was in the Boeing 787 aircraft’s second black box, which the Indian authorities said they had found on Sunday.

Air India flight AI171, a Boeing 787-8 carrying 242 people, crashed after taking off from Ahmedabad on its way to London.