The EMI Mine. In 1940 the Germans undertook the development of a mine case that would house an induction-type magnetic unit. To reduce development work, they inten-ded to utilize a suitably modified EMC case, which was to be known as EMI. After preli-minary development work had been done, the mine was dropped for the following rea-sons:

1. Shortage of nickel and copper prohibited the large scale use of naval induction units.

2. Induction units had not been sufficiently developed to permit their use in moored mines.

The EMI was the only attempt by either the German Navy or the Luftwaffe to develop a moored induction-type mine.