Also, the two UE1-class minelaying boats laid minefields in the White Sea.
From the en.wikipedia.org
The ship supported a minelaying operation on 11-12 September off Texel.
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The Russians learned quickly, and soon employed the Japanese tactic of offensive minelaying.
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The U.S. concluded Libya was probably responsible for the minelaying.
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However, the Russians soon learned the Japanese tactic of offensive minelaying and decided to play the strategy too.
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Renown arrived at the Vestfjord late that night and maintained position near the entrance while the minelaying destroyers proceeded to their task.
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They were also assembling 3 Type UC I minelaying submarines, which were ordered converted into transports to carry small quantities of critical supplies to Turkey.
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In conjunction with attacks by aircraft, including aerial minelaying, U.S. submarines had effectively destroyed the Japanese merchant fleet by January 1945.
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More examples
Mining: laying explosive mines in concealed places to destroy enemy personnel and equipment
Minelaying is the act of deploying explosive mines. Historically this has been carried out by ships, submarines and aircraft. Additionally, since World War I the term minelayer refers specifically to a naval ship used for deploying sea mines. ...