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A remotely operated vehicle capable of reaching the sea bed and transmitting images to the surface is deployed by French researchers.
Watch: Passenger recalls losing contact Video What happens if oxygen runs out Experts had warned about safety Video 1 minute 10 seconds Video 1 minute 10 seconds 1:10 Video 1 minute 10 seconds Titanic sub: The latest in 70 seconds The BBC's Jon Amos looks at what we know so far about the sub that went missing in the Atlantic.
2h 2 hours ago US & Canada Ukraine strikes bridge to Crimea, says Russia The bridge linking the peninsula to Kherson in the south was hit by British missiles, say officials.