US Coast Guard and international agencies investigate Titan sub implosion and improve submersible safety.

The US Coast Guard is leading an investigation into the implosion of the Titan submersible, which killed all five people on board. The accident occurred while the vessel was carrying people to the Titanic wreckage. Maritime officials plan to issue a report aimed at improving the safety of submersibles worldwide. The investigation is complicated by the fact that the world of deep-sea exploration is not well-regulated. The final report will be issued to the International Maritime Organization.