Dahlbusch Bomb

In its original form it is a torpedo-shaped cylinder with a length of 2.5 metres (8.2 ft), developed to transport trapped miners through boreholes after mining accidents.

[1] Its distinguishing feature was the small diameter of only 38.5 centimetres (15.2 in), which allows miners to be evacuated through significantly smaller boreholes than using other evacuation devices, and whose shape also helps in raising and lowering the device across long distances.

At Zeche Dahlbusch, the device was successfully used to rescue three miners, trapped at a depth of 855 metres (2,805 ft) after a mine collapsed, through a vertical borehole drilled 42 metres (138 ft) from the next-higher mine level.

The 15.2-inch diameter would need its passenger to have his shoulders hunched up or his arms vertical above his head, and not be obese or very muscular.

The "Phoenix" (Fénix) evacuation devices used in the rescue of 33 miners after the 2010 Copiapó mining accident, in Chile, are an enhanced version of the Dahlbusch Bomb.