The OSS had a similar project called Black Joe under the R&D branch. It looked just like coal except it was stuffed with explosives. The Germans might shovel it into their boilers and it would explode a train. One of my favorite stories from the book is this guy, William Fairbairn. He teaches OSS recruits some of these techniques. That was really fun to kind of research and write about because he's certainly an interesting character.

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