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hms unseen s41

  1. HMS UNSEEN S41

    HMS UNSEEN S41

    The Upholder class of four (4) submarines, also known as the Type 2400 (due to their displacement of 2,400 tonnes), were diesel-electric fleet submarines designed in the UK in the late 1970s to supplement the Royal Navy's nuclear submarine force. They were decommissioned with the end of the Cold W
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