British Admiralty to Vice Admiral Sir Dudley R. S. de Chair
From Admiralty No. <9>
To N.A., Washington. DATE
<Your 1700.> For Admiral de Chair.
From all experience Admiralty consider project of attempting to close exit to North Sea to enemy submarines by method suggested to be quite impracticable. Project has previously been considered and abandoned. The difficulty will be appreciated when total distance, depths material and patrols required and distance from base of operations are considered. Even were it practicable to lay, maintain and protect such a barrage it would not owing to want of resilience prove effective against the passage of submarines fitted with cutters. . . .
Source Note: Cy, UK-KeNA, Admiralty 137/655. In the left margin is stamped: “COPIED.”