Search crews fight against the clock to find missing submersible

The search continued Wednesday for the Titan, a five-passenger submersible that disappeared during an expedition to the wreckage of the Titanic in the Atlantic. While scouring the ocean, Canadian planes detected underwater banging noises. Officials say the occupants may only have enough oxygen left to survive until Thursday morning. Roxana Saberi has the latest. #submersible #titan #titanic "CBS Evening News with Norah O'Donnell" delivers the latest news and original reporting, and goes beyond the headlines with context and depth. Catch the "CBS Evening News" weeknights at 6:30 p.m. ET on the CBS Television Network and at 10 p.m. ET on the CBS News app. Subscribe to the "CBS Evening News" YouTube channel: https://bit.ly/1S7Dhik Watch full episodes of "CBS Evening News": https://cbsn.ws/23XekKA Follow "CBS Evening News" on Instagram: https://bit.ly/1T8icTO Like "CBS Evening News" on Facebook: https://on.fb.me/1KxYobb Follow "CBS Evening News" on Twitter: https://bit.ly/1O3dTTe Download the CBS News app: https://cbsn.ws/1Xb1WC8 Try Paramount+ free: https://bit.ly/2OiW1kZ For video licensing inquiries, contact: licensing@veritone.com