@howitworkssss: That famous viral clip captures one of the most jaw-dropping spectacles in pyrotechnic history. What you are seeing is a masterclass in Japanese shell manufacturing, typically featuring either the Sanjakudama (36-inch shell) launched regularly at the Nagaoka Fireworks Festival, or its massive sibling, the Yonshakudama (48-inch shell), which is famously fired in nearby Katakai town. These aren’t your average backyard firecrackers—they are massive, building-sized artillery shells that require custom steel launch tubes buried deep in the earth just to contain the initial blast