Search For Lost Argentine Submarine ARA San Juan Hits 'Critical Phase' as Air Supply May Run Out

Even if the ship is still intact, any crew on board would be in mortal danger.

from gizmodo http://www.gizmodo.co.uk/2017/11/search-for-lost-argentine-submarine-ara-san-juan-hits-critical-phase-as-air-supply-may-run-out/