Vice Admiral William S. Sims, Commander, United States Naval Forces Operating in European Waters, to the Office of the Chief of Naval Operations
File No. <25-32-1>
Cablegram Sent 23 February 1918. ROC
To Opnav, Washington. Serial No. 4323
Prep. by O-4 SX D.R.
4323. Plans call for a K. tube sound barrage thirty five miles north of Dover-Calais line to prevent surprise raids on Dover barrage. Request twelve K. tubes complete immediately by first steamer. If necessary they should be diverted from sub-chasers for this work.
Source Note: Cy, DNA, RG 45, Entry 520, Box 337.