With a submarine crewed by 44 sailors missing off the coast of Argentina, we recall some of the worst submarine disasters in history. Ships and planes hunting for the ARA San Juan with 44 crew members will return to a previous search area after officials said Wednesday that a seismic anomaly was detected hours after the final contact with the boat and could have come from the sub.

The sound originated about 30 miles north of the submarine’s last registered position. Naval experts say that oxygen for the crew would last only seven to 10 days if the sub were intact but submerged. If the boat had replenished its oxygen supply before diving, this would affect the calculation.

 
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