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Back in about 1979 I worked for a company based in the laboratory block of the closed East Moors steelworks in Cardiff, and we were occasionally told by site security to stay away from the windows at a particular time, and there's be a resounding bang and a crash as another furnace fell to the ground. One of the few remaining structures was a concrete silo, actually 3 or 4 silos forming a single building about 100 feet, that used to contain ore, coke and limestone. The local councillors, MPs, and other prominent people were invited to a grand ceremony, with a meal and cocktails laid out on trestle tables a safe distance away. The Lord Mayor made a long speech about wiping out the past to make way for the new technological future (usual politician's waffle) and with a flourish, pressed a gold-painted button on the table, connected to a gold-painted cable going into a temporary hut for the demolition contractors. There was an explosion at the base of the silo, but instead of collapsing it just wobbled a bit. A seagull perched on top walked to the edge of the silo and looked down to see what the noise was about!
It turned out that the silo had been built at the beginning of WW2 and was designed to withstand bombing. The contractors spent the next few months wacking it to pieces with the largest wrecking ball I'd ever seen, and every few hours' wacking they had to hoist someone up with a gas axe to cut through a tangle of rebar.
Pete
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