The Missing Submarine

This week we are live from the French Riviera, Saint-Trapé. We'll try and figure out what's going on in these guys' minds coming up next to kiss. The missing submarine that some tourists went down near the Titanic. And there's just no sign of these guys. It could be something simple, like a corroded connector or an electrical fault. How do you rescue someone from so deep in the ocean? If the ping's gone, does that mean there's no power? Does thatmean there's no air?