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this post was submitted on 14 Aug 2023
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Type 212, German-Italian, 214 is the export version without anti-magnetic dishwashers. I'm quipping, the exact differences aren't really known but 212s do have antimagnetic diswashers and 214s are lacking some secret sauce but are still very capable.
Hydrogen fuel cell air independent drive, they're not fast but very quiet, undetectable via active or passive sonar as well as magnetic sensors. Which makes them undetectable because there's no such thing in the real world as gravimetric sensors (with range that doesn't mean you've bumped into them anyway). Can traverse very shallow waters allowing combat divers to exit to shore, can also dive very deep because the Mediterranean is actually quite deep -- strange combination of capabilities due to joint German/Italian design. Definitely capable of dropping two mines on pipes without anyone noticing.
By contrast US submarines are nuclear, meaning they're glorified steam engines, quite loud. The Danes would have heard you enter the Skagerrak and then kept eyes on you, wondering WTF a nuclear deterrent submarine is doing in the Baltic Sea. Only alternative route would have been via the Kiel Kanal and... no.
A particularly foul-mouthed gooseberry pudding.
Thanks for the submarine lesson, that was an interesting read.