The estate of a French explorer killed along with others in the implosion of the deep-sea submersible Titan last year has sued the company that built it and embarked on the deadly trip to the Titanic wreckage.

The estate of a French explorer killed along with others in the implosion of the deep-sea submersible Titan last year has sued the company that built it and embarked on the deadly trip to the Titanic wreckage.