Wendy Rush, the wife of OceanGate CEO Stockton Rush, unknowingly heard the moment the deep-sea Titan submersible imploded with her husband and other passengers onboard.

The US Coast Guard has released footage, obtained by the BBC, revealing the submersible’s final communications. Wendy, also a director at OceanGate, was tracking the dive when the Titan suddenly went silent around 90 minutes into its descent. At nearly 11,000 feet underwater, the sub suffered a devastating implosion.