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| 01 Hedgehogs | 02 Hedgehogs | 03 Hedgehogs |
The hedgehogs are an anti-submarine mortar launcher. When the ship contacted submerged submarine using sonar, the boat would be steered towards the sub's position. When the submarine was directly ahead the hedgehogs would be fired, landing in a grid pattern and sinking straight down. If one contacted a submarine, all would go off together. If not, then there would be no explosion and the sonar contact with the sub would not be broken as it would be when using depth charges.