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Originally Posted by Helpher811
I understood that concrete also weakens at sufficiently high temperatures.. which makes me wonder how underwater demolitions are done.....
hhmmmm.....
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Demolitions rely on the concussive force of explosives placed in bored holes and the shearing force of shaped charges. If a structure is very sturdy or needs to fall in a certain direction, "kicker" charges made of concussive explosives are used to push the supports to one side after they are cut by shaped charges. For scuttling ships, charges are used to blow holes in the hull; either shaped charges cut the hole where it's intended to be or concussive charges impact the hull and displace large amounts of water, which quickly rushes back into the void made by the expanding gases, slamming into the weakened hull and puncturing it.