Former sub commander not optimistic about finding vessel A search is underway for the Titan submersible Officials estimate the sub has less than 40 hours of "breathable air" left Former submarine commander Capt. Don Walsh says he's not optimistic Liz Jassin Updated: Jun 21, 2023 / 12:23 AM EDT Main Area Top ↴ test Main Area Middle ↴ Trending on NewsNationNow.com US investigating unauthorized release of classified documents on Israel attack plans Delphi killings: Timeline of events in Richard Allen case Video At least 7 dead after ferry dock gangway collapses on Georgia’s Sapelo Island Man charged in NYC subway chokehold death set to stand trial What we know after Diddy’s houses were raided Video Hurricane Oscar makes landfall in the Bahamas and heads toward Cuba