The missing Titanic-bound tourist submersible has about 41 hours of breathable oxygen left – and even if the vessel is located, it would pose a “challenging” rescue operation, the US Coast Guard said.

A deep-diving tourist submersible that went missing near the wreck of the Titanic with five people on board has "about 40 hours of breathable air" left, captain Jamie Frederick of the US Coast Guard ...

Alex Sundby is a senior editor at CBSNews.com. In addition to editing content, Alex also covers breaking news, writing about crime and severe weather as well as everything from multistate lottery ...

In a press briefing this afternoon, Captain Jamie Frederick of the US coast guard gave details of the "complex" search and rescue operation now underway to locate the missing submarine. One of the ...