Rescue efforts are ongoing for the missing Titanic sub.

In this live Newscast, Adam is joined by three guests to help understand why a tourist submersible carrying five people went missing while diving to the wreck of the Titanic.

Simon Platts directed a BBC documentary episode about the Titanic sub last year. David Russell was a Royal Navy submariner in charge of the British response to the Kursk submarine disaster in 2000. And Heather Gillis from CBC News joins us close to the wreck site of the Titanic in Newfoundland and Labrador.

You can join our Newscast online community here: https://tinyurl.com/newscastcommunityhere

Today's Newscast was presented by Adam Fleming. It was made by Tim Walklate with Fiona Leach, George Dabby and Alex Collins. The technical producer was Philip Bull. The senior news editor was Sam Bonham.