submersible

"I’m so worried he kills himself and others in the quest to boost his ego," David Lochridge said of the company's CEO in the note.
The recovered debris and evidence from the submersible will be sent for further testing and analysis.
Christine Dawood was on board the host ship when the submersible carrying Suleman and Shahzada Dawood to the Titanic lost communications.
Officials have said they believe the people on board the vessel that had gone missing near the Titanic wreckage were dead.