Hedgehog

Enigma was being nice the last couple of days and actually decided to work :!!: I was playing the LFN Surface 1 mission and was trying to kill the sub. I hit it with about 4 hedgehog shells, possibly more, I only saw 4 waterspouts, but the thing wouldn't die. How many hedgehogs does it take to kill a sub?

depends on where they hit

In reality, a single volley of hedgehogs can sink a sub since they're all supposed to detonate once one of them hits the sub. I have no idea how many it takes on the game.