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Essentially it's what german engineers built in the 60s. ;-) http://de.wikipedia.org/wiki/Dahlbuschbombe http://de.wikipedia.org/wiki/Dahlbuschbombe http://ww

• ed 16y ago
  Wow, that's pretty close. English Translations: http://translate.google.com/translate?hl=en&sl=de&tl=en&u=http://de.wikipedia.org/wiki/Dahlbuschbombe http://translate.google.com/translate?hl=en&sl=de&tl... http://translate.google.com/translate?hl=en&sl=de&tl=en&u=http://www.bergbaumuseum.de/web/Dahlbuschbombe http://translate.google.com/translate?hl=en&sl=de&tl... More on that particular mine collapse: http://en.wikipedia.org/wiki/Lengede http://en.wikipedia.org/wiki/Lengede