Christine Dawood had initially planned to go on the doomed voyage with her husband but stepped back because her 19-year-old son Suleman (pictured with Christine) really wanted to go .
The US Navy detected sounds consistent with an implosion soon after Titan lost contact but it was not definitive and the detail was not released publicly - with the search continuing until debris was found.
Christine Dawood was on Titan s mothership, the Polar Prince, when news came through that they had lost communication with the submersible shortly after it began its descent last Sunday.