For those that will - it will be possible to choose mines as an armament preset before a battle after the respective modification has been researched. You will be able to select the mine depth (how deep it sits in the water) before launching your chosen vessel in a battle - there will be several variants suitable against different enemy vessel types. If you choose a depth of less than 1 metre, it will explode no matter what vessel runs over it, but it can be easily spotted on the surface.

A mine floating on the surface can be destroyed easily with guns and if it is placed deeper than 1 metre, it won’t be visible, however vessels with smaller draughts will not receive any damage from it. Like torpedoes, mines will display a marker at a specific radius - at the moment it is set to 100m but the distance might change dependant on testing.