SSKs are highly dangerous where they choose to wait, even though they lack the sustained speed and range of nuclear submarines. When stationary and running quietly, their noise can disappear into the ocean background, making the mobile-minefield analogy especially apt. Carrier-group submarines may also be needed for special-forces insertion and intelligence collection, limiting the number available for escort work. A layered defence uses submarines, frigates, helicopters, and successive engagement zones to reduce the chance of a threat reaching the carrier.
Notable Point · 38:29-40:58
Diesel-electric submarines and layered carrier defence
Quiet diesel-electric submarines can act like mobile minefields, so a carrier group needs submarines, escorts, and helicopters working through layered anti-submarine defence.