機雷
A [b]naval mine[/b] is an [[explosive]] [[mine (weapon)|device]] placed in water to damage or destroy [[ship]]s or [[submarine]]s. Unlike depth charges, mines are deposited and left to wait until they are triggered by the approach of, or contact with, any [[watercraft|vessel]]. They often take shape of a spiked metal sphere.

h1. See also
* [[depth charge]]
* [[List of Weapons]]
* [[torpedo]]
h1. External links
* Wikipedia: "Naval mine":https://en.wikipedia.org/wiki/Naval_mine
naval mine