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Join this channel to get access to perks: Want to learn more about Periscope Film and get access to exclusive swag? Join us on Patreon. Visit Visit our website The film was made by the United States Mine Safety and Health Administration and released by the National Audiovisual Center in 1981. This film explores the use of explosives in underground blasting operations, including the use of detonators and dynamite. The film re-enacts and analyzes a serious blasting accident. It also follows a blasting crew through the various stages of underground blasting, including preparation of a proper blast plan, while describing the specific safety practices that must be observed at each step -- drilling, loading, detonation, and post-blast examination. The film opens with a scenario of two miners, one in a drill car, and the other neglecting procedure and telling the driller to drill, causing an explosion (0:50 Graphic). (1:52), the narrator says that blasting accidents are caused by one or more violations of safety regulations. The four categories of safety procedures are described (2:46). The section on drilling starts (3:02). A blasting galvanometer is shown being used by a miner (3:49). A mining drill is shown drilling into the cave (5:06). (5:22), the next section on loading begins. An explosives loading cart (5:31). Bags of explosive material and boxes of electric blasting caps are shown being unloaded (6:24). The narrator states the maximum tolerable stray current (6:36). A miner is shown loading blasting holes, he is using a tamping pole, hole punch, and primer (6:50-7:05). (From 8:43-9:20), pneumatic loading is demonstrated. A miner using a blasting galvanometer and testing blasting lines (11:09). (At 12:00), the section on detonation begins. A miner is shown tying blasting wire onto a detonator (13:25). (Starting from 13:54), the next section on post-blast examination begins, with a discussion about misfires. A Wagner loader and Caterpillar material loading equipment are shown during the film's conclusion (15:32). A miner declares “Fire in the hole!“ prior to firing the explosives using an electric detonator (16:17). The film ends (16:28). We encourage viewers to add comments and, especially, to provide additional information about our videos by adding a comment! See something interesting? Tell people what it is and what they can see by writing something for example: “01:00:12:00 -- President Roosevelt is seen meeting with Winston Churchill at the Quebec Conference.“ This film is part of the Periscope Film LLC archive, one of the largest historic military, transportation, and aviation stock footage collections in the USA. Entirely film backed, this material is available for licensing in 24p HD, 2k and 4k. For more information visit
