I saw that as a NOVA documentary[0]. They also had a sequel of sorts, "Secrets of the Viking Sword" that showed a modern blacksmith trying to re-create crucible

I saw that as a NOVA documentary[0]. They also had a sequel of sorts, "Secrets of the Viking Sword" that showed a modern blacksmith trying to re-create crucible steel from that era[1]. [0]https://www.pbs.org/wgbh/nova/ancient/secrets-samurai-sword.html https://www.pbs.org/wgbh/nova/ancient/secrets-samurai-sword.... [1]https://www.imdb.com/title/tt2204408/ https://www.imdb.com/title/tt2204408/