KNX In Depth's Charles Feldman and Rob Archer discuss the tragedy near the Titanic with debris from the missing submersible found. The five people on board are presumed dead. 

Back with us is Tad Fitch who's been following this situation. He's co-authored a few books on the Titanic including On a Sea of Glass: The Life & Loss of the RMS Titanic. 

(Photo by Scott Eisen/Getty Images)