Dahlusch Bomb mine collapse rescue device. Invented in 1955, but most famously used in the 1963 West German Lengede mine rescue.
https://diqn32j8nouaz.cloudfront.net...cue_device.jpg
More:
https://en.wikipedia.org/wiki/Wunder_von_Lengede
https://en.wikipedia.org/wiki/Dahlbusch_Bomb
https://en.wikipedia.org/wiki/F%C3%A9nix_capsules
Previously:
https://www.homemadetools.net/forum/...741#post163461
https://www.homemadetools.net/forum/...734#post139991
https://www.homemadetools.net/forum/...573#post128222
https://www.homemadetools.net/forum/...667#post128677
https://www.homemadetools.net/forum/...092#post164922
