Submarine-laid mines, normally used in offensive operations, are specially configured mines that are launched from the torpedo tubes of submarines. When secrecy is paramount, the submarine is the preferred mine-laying vehicle. Although submarines can carry mines great distances from home ports, they are not conducive to carrying large payloads. Tactically, the limited number of mines that a submarine can carry may be considered a disadvantage, but the secrecy with which a submarine can deliver mines to an enemy port or operating area at great distances from friendly bases provides an overwhelming tactical advantage. Submarines can be highly effective in the minelaying role as they are capable of covert operations, permitting them to enter waters normally denied to surface ships or aircraft because of enemy forces, bad weather, or ice.
Most attack submarines can carry and lay mines.
Surface-laid mines are no longer in the US stockpile of active weapons. Surface laying is the most economical method of delivery because of the greater number of mines that can be carried in the vehicle. But, there are unacceptable constraints which necessitate the utilization of other methods of delivery. Method of Actuation Mines can be activated by contact, target influence, or remote control. Contact mines are activated by physical touch and are the oldest and most common type.