Admiralty Mining Establishment

The Admiralty Mining Establishment originally known as the Mine Design Department was a technical department of the British Royal Navy responsible for both the design of naval mines and the development of suitable countermeasures from 1915 to 1951 == History == A mining department was originally established at the Admiralty in 1915, in 1919 the name was changed to the Mine Design Department (MDD) based at HMS Vernon in Portsmouth. In 1946, after being dispersed to various places during the war, in keeping with many technical departments it employed both military and highly skilled, civilian personnel.

Source: Wikipedia — Admiralty Mining Establishment (CC BY-SA 4.0)