Family of UK billionaire missing on Titanic sub 'grateful' for

Stepson of billionaire killed on Titanic sub defends attending

Pray for their safety': British-based father and son trapped on

Titanic submarine search: Family of missing British billionaire

Ships, planes search for sub that went missing on trip to Titanic

British billionaire Hamish Harding on board missing Titanic

Faces of crew missing on Titanic submarine - from Brit billionaire

Brit billionaire explorer missing as Titanic sub vanishes off

Sub passengers included CEO of expedition company, experienced

Family of missing British billionaire 'have great faith and trust

Seven hours without contact and crew members aboard. Missing

Stepson of Missing Billionaire on Titanic Sub Lashes Out at Tucker

Billionaire aboard missing Titanic sub is a Maltese citizen