M Class | Guide 396

In today’s guide, we explore the extraordinary M-Class submarines of the British Royal Navy — some of the most unusual submarines ever built.

Originally conceived as heavily armed “submarine monitors,” the class evolved into experimental platforms that included a minelayer and even an underwater aircraft carrier. Bold, unconventional, and ahead of their time, the M-Class boats reflect a period of intense innovation in naval warfare.

Join us as we examine their design, purpose, and the remarkable ideas behind these unique submarines.