Vice Admiral William S. Sims, Commander, United States Naval Forces Operating in European Waters, to the Office of the Chief of Naval Operations
Subject Copy File No.
Cablegram Sent 3 February 1918. ROC.
To Opnav, Washington. Serial No. 3600
Prep. by NCT SX D.R.
3600. Your 2686. AYLWIN begins channel patrol with hunting unit to test apparatus under war conditions February fourth full report will be made. Preliminary tests with British submarine confirmed results obtained in United States. Urgently recommend work development trailing wire device or other means detecting submarine on bottom be expedited. Progress here not satisfactory. Hunted submarines in channel invariably take refuge on bottom.
Source Note: Cy, DNA, RG 45, Entry 517B.