HMS M3 M-Class Submarine Minelayer Building Blocks

Recreate another fascinating chapter in the evolution of Britain’s experimental M-class submarines with the HMS M3 M-Class Submarine Minelayer Building Blocks. Designed and authorized by ModelFunShipyard, this 148-piece model is inspired by HMS M3, the third vessel of the M-class submarine monitor program and later one of the Royal Navy’s most unusual experimental minelaying submarines.

Originally designed around the same heavy-gun concept as HMS M1 and HMS M2, M3 underwent a major transformation after the loss of M1 in 1925. Its 12-inch (305 mm) main gun was removed, and the submarine was converted into a prototype minelayer with a long upper hull containing a dedicated mine-handling system.

From Submarine Monitor to Minelayer

HMS M3 began as part of the experimental M-class submarine monitor program, but its role changed dramatically when it was converted from a heavy-gun submarine into a dedicated minelaying test vessel.

Extended Upper Hull Design

The converted submarine featured a distinctive elongated upper structure, giving HMS M3 a very different silhouette from conventional submarines of the period.

Integrated Mine Conveyor System

Inside the extended upper hull, a conveyor system was installed to transport and deploy naval mines, forming the centerpiece of the submarine’s experimental minelaying configuration.

An Important Naval Experiment

The M3 conversion was intended to test the practicality of submarine-based minelaying and contributed to the development of minelaying concepts later used by other Royal Navy submarine classes.

Compact Historic Naval Model

With 148 pieces, the model offers a quick building experience while capturing the unusual proportions and specialized role that distinguish HMS M3 from its sister ships.

From the Designer

ModelFunShipyard created this model to represent HMS M3 after its conversion into an experimental submarine minelayer, focusing on the elongated upper hull and internal mine-handling concept that defined the vessel’s later configuration.

A Unique Addition to an M-Class Collection

Together with HMS M1 and HMS M2, this model highlights the remarkable evolution of the M-class from heavy-gun submarine monitors to experimental aviation and minelaying platforms, making it an excellent display piece for submarine enthusiasts and naval history collectors.