The family of a French explorer who died in a submersible implosion has filed a more than US$50 million lawsuit, saying the crew experienced ‘terror and mental anguish’ before the disaster and accusing the sub’s operator of gross negligence.

The family of a French explorer who died in a submersible implosion has filed a more than US$50 million lawsuit, saying the crew experienced ‘terror and mental anguish’ before the disaster and accusing the sub’s operator of gross negligence.