Heligoland, a tiny island that survived the second largest non-nuclear explosion in human history

'With 4,000 torpedo heads, 9,000 depth charges and more than 91,000 shells – all in all some 6,700 tons of explosives – set aflame, a 40-mile-tall black mushroom cloud rose above Heligoland and shook the island to its core. The detonation, a third of what had happened in Hiroshima two years before, was registered as far away as Sicily.'

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