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I want to explain this in a few words: If
miners underground cannot get back to the portal or to the shaft because for
example rocks have fallen into the roadways, it is very hard to reach them and
bring them back to the surface. Often there is no other possibility than
building another, very small shaft from the surface to the place where the miners
are expected to be. If the place of the shaft was right and the miners are found, the
Dahlbusch bomb is used to bring them back to the surface.
The Dahlbusch bomb is named after
it's first practical use in 1955. In that year it was possible to rescue three
miners after an underground fire from a depth of about 900 metres. That was -
correctly - at the Dahlbusch colliery in Gelsenkirchen-Rotthausen (Germany).
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