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There have been other threads about massive skyscrapers, Tillman maximum battleships, and nuclear zepplins, but the challenge for this thread is to develop a timeline where massive submarines are built. It puzzles me that there haven't been other threads about this topic because the phallic imagery involved could only possibly be surpassed by zepplins. I believe the Soviet Typhoon class is/was the biggest OTL, but how big can they get? Submersible battleships or aircraft carriers? How absurd can they get? Are there any infamous plans for outrageous submersibles OTL?