HC Deb 20 March 1917 vol 92 c619W
Mr. HOUSTON

asked the First Lord of the Admiralty whether he can state the maximum surface speed of enemy submarines and the maximum submerged speed of the same; and whether these speeds apply to the latest type of enemy submarines now operating?

Dr. MACNAMARA

There is no definite information, but the surface speed is probably 14 to 20 knots, and the submerged speed 8 to 10 knots.