FILE-The Polar Prince arrives at the port in St. John's, Newfoundland in this June 24, 2023, file photo. Authorities from the U.S. and Canada began the process of investigating the cause of the fatal Titan submersible implosion even as they grappled with questions of who was responsible for determining how the tragedy unfolded. The deadly implosion of an experimental submersible en route to the deep-sea grave of the Titanic last June has not dulled the desire for deep-sea exploration. Tuesday, June 18, 2024, marks one year since the Titan vanished on its way to the historic wreckage site. (Adrian Wyld /The Canadian Press via AP, file)