Prototype for The Royal Navy’s First Long-Range Diesel-Powered Submarines Protected.

https://historicengland.org.uk/whats-new/news/prototype-long-range-diesel-powered-submarines-protected/#:~:text=HMS/m%20D1%20was%20built,%C2%A9%20Wessex%20Archaeology        from Blogger https://ift.tt/3PqxTF2via IFTTT