the adversary knows where it's at. a quiet electric drive would have given the chinese a fingerprint for that sub's movement throughout the ocean. that allowed them to track it and eventually destroy it. >> if a foreign power knows the acoustic signature of a submarine, then they can kill that submarine. >> quiet electric drive was at risk. that may have already gone to china or may soon go to china. >> so that's why there's a much greater fear in failing to catch chi mak. >> in 2004, the chinese didn't have a strong navy capability. they were really a brown water navy. a navy stable to operate in shallow water. chi mak chose the chinese