Mine rails allow destroyers to contribute to bastion defense. The proposed arrangement places mines above friendly submarines, whose crews know where the minefield lies and can operate beneath it. Attackers would have to stand off or negotiate the mined water. Even a low helicopter using dipping sonar could risk triggering a mine in this scenario.
Notable Point · 1:19:21-1:20:13
Minefields above a submarine bastion
A proposed bastion arrangement uses mines above friendly submarines to force attackers away from the defended water.