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. 28-8-3
20 June <21,> 1918. RLM
To Opnav, Washington. Serial No. 9913
PreP. by: CS NCT D.R.
9913. Foreseeing possible need of type of mine that can be successfully laid in five hundred fathoms of water, recommend Bureau undertake develop
ement of such a mine. 00121 9913.
Source Note: Cy, DNA, RG 45, Entry 517B. Identifiers “1/3/A/J” appear on the right side in columnar fashion. The handwritten date is confirmed by the time/date stamp at the end of the cable.