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Diesel-electric still causes global warming which would ultimately wipeout whales. Also, you are behind from watching too many Hollywood sub movies and stuck in the WWII tech level, they have anti sonar scrambling buoys and many other systems which keep them completely running on silent or stealth motionless stations, and just one thermo-nuclear device from one sub can destroy a whole large city and 20 million people, and that is why it is deterrence mostly.