Search for missing Titanic sub expanding to deeper waters, U.S. Coast Guard says

Authorities are expanding their search into deeper waters for a submersible that disappeared while taking wealthy tourists to the Titanic wreckage off the coast of Canada, a U.S. Coast Guard official said on Tuesday.

"As we continue on with this search ... we've been working through the night with a broad group of partners to bring all capabilities to bear looking on both the surface and now expanding to a subsurface in the area," U.S. Coast Guard Rear Admiral John Mauger told CNN in an interview.