The Coast Guard said Paul-Henri Nargeolet, a noted explorer who was aboard the submersible when it imploded, is believed to have been sending the final round of messages. The last one, just seconds before contact was cut, was apparently about the vessel dropping weights while near the Titanic.

The Titan‘s support ship master reported feeling his vessel shudder around the time communication was lost with the ill-fated submersible. On Friday, September 27, during a two-week hearing by the U.S.