Would it be possible to compress enough matter into a small enough space using explosives, using roughly the same concepts as a nuclear bomb? of course, this couldn't be done with traditional explosives, but maybe with some sort of nuclear or even antimatter explosion, using some sort of gas such as helium as a reaction mass that could rapidly expand with the heat generated and produce enough pressure to form a black hole(i have know idea if this would work btw). What other explosives could generate such a pressure? If this was remotely possible, on what scale would it need to be done to form the event horizon(eg. country sized, earth sized, sun sized...)?
Sort of. Black holes are produced by supernovae. A supernova is when a star at the end of its life erupts into a giant explosion. But it isn't the explosion that produces the black hole.
A very brief version of the story is at https://spaceplace.nasa.gov/supernova/en/
Wikipedia has more. https://en.wikipedia.org/wiki/Supernova