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In page Naval mine:

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Laying a minefield is a relatively fast process with specialized ships, which is today the most common method. These minelayers can carry several thousand mines[citation needed] and manoeuvre with high precision. The mines are dropped at predefined intervals into the water behind the ship. Each mine is recorded for later clearing, but it is not unusual for these records to be lost together with the ships. Therefore, many countries demand that all mining operations be planned on land and records kept so that the mines can later be recovered more easily.[1]