Sea mines are explosive devices placed in water to damage or destroy ships and submarines. They can be anchored to the seabed or float in the water, and they are triggered by contact, pressure, or magnetic fields. Sea mines are often used in military operations to protect coastlines or restrict enemy movement. There are two main types of sea mines: moored mines, which are tethered to the seabed, and drifting mines, which float freely. Sea mines can remain dangerous for years after conflicts end, posing risks to navigation and marine life. Efforts to clear them are essential for safe maritime activities.