Video footage released by the US Coast Guard shows the moment the wife of the late OceanGate CEO Stockton Rush heard the apparent sound of the Titan submersible imploding. In the video, Wendy Rush, a director at the ocean tourism company — which has since suspended all operations — can be seen attempting to contact the sub from the Polar Prince support vessel when a loud slamming sound can be heard through her monitor.

You’ll hear a noise that’s external to the room and you’ll see their reaction to it,” one Coast Guard officer explained, comparing the sound to a slamming door.

Video shows Wendy Rush, the wife of OceanGate CEO Stockton Rush, apparently reacting after sound now thought to have come from sub implosion.