HSwMS Sjoormen ("Serpent") was a Cold War-era diesel-electric attack submarine designed, developed and built in Sweden for the Swedish Navy. much thought and care was given to making the Sjoormen-class a quiet, fast undersea hunter and this involved the fitting of rubber tiles to the single hull design. The class provided the Navy with decades of faithful service before the line of five boats was given up in favor of more modern designs. The class is also notable in becoming the first in naval history to utilize a cruciform rudder plane arrangement at the stern.
The Sjoormen-class succeeded the outgoing Draken-class of which six boats were built and operated from 1962 until 1988. The Sjoormen boats were, themselves, succeeded by the Nacken-class (A14) which numbered three units in all.
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