From your link: "The fiber optical link would then be used by the crew to verify the target, confirm the intercept and perform battle damage assessment." This

From your link: "The fiber optical link would then be used by the crew to verify the target, confirm the intercept and perform battle damage assessment." This thing is literally dragging a fiber optic cable behind it, with a sensor package that is apparently left behind at the sea surface when the missile transits into the air, that allows the submarine to see the helicopter target before and after missile impact, and to abort the missile strike if necessary.