A challenging search in remote waters intensifies for the missing submersible that was touring the Titanic wreckage with 5 on board

What we know about the missing Titanic-exploring submersible

Titanic tourist submersible: Rescuers scan ocean as clock ticks

Titanic tourist submersible: My trip aboard the sub

Titanic submarine: What we know about the search for the missing OceanGate expedition

Hamish Harding: British adventurer among crew missing on Titanic sub

Submarine exploring Titanic wreck missing, search underway

A search and rescue operation is underway for a submarine touring the wreckage of the Titanic

Titanic tourist sub goes missing sparking search

Megalodon tooth necklace spotted in digital scan of Titanic wreck

'Largest underwater scanning project in history' gives never-before-seen view of Titanic