A boom defence vessel was a small auxiliary ship whose primary function was to lay and maintain steel anti-torpedo nets. This photograph, taken by Lt S J Beadell RN, shows boom defence in operation at the Royal Navy dockyard of Rosyth. The submarine L26 is seen with her bows covered with an anti-submarine net alongside the boom vessel. And, just in case you were wondering, the design features a custom typeface inspired by a stencil font we found on an old navy kitbag!
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