thank you. new developments this morning in the desperate search for the missing submersible that disappeared on its way to the site of that titanic wreckage. crews searching for the titan submersible heard banging sounds picked up by sonar devices according to an internal government memo. 24 hours of breathable air left for the five people onboard, the sounds offer a spark of hope in this massive search operation. joining us now world-renowned explorer and air cha man of an environmental non-profit the solar impulse foundation, dr. bertrand picard, the son of swiss oceanographer jacques picard who, among many, many accomplishments, invented the first submarine to carry tourists. so you are the right person to speak with about this. thanks for your time. first, when you heard the news of the banging sounds and the