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A magnetic mine is a naval weapon designed to explode due to the magnetic field of a passing metal ship. Submarine mines are underwater explosive devices that detonate when a ship or submarine comes close. These mines are typically anchored spheres containing explosives and are deployed offensively or defensively.12

Detonation can be triggered by contact, magnetic fields, pressure changes, or sound. Magnetic mines specifically react to a ship's magnetic field. Mines were particularly effective in World War I and II, sinking numerous ships. Minesweepers are naval vessels designed to clear these underwater hazards.23

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