HC Deb 06 December 1939 vol 355 c641
44. Sir M. Sueter asked the First Lord of the Admiralty whether the details of the apparaťus that makes the detonators of ťhe magnetic mines active, can now be disclosed?

Mr. Shakespeare

I think it would be better not to make public at the present time the technical details of our knowledge of these mines.

Mr. Thorne

Is it not the job of the Admiralty to find out how the mines get there?