Due to a shortage in the supply of enriched Lithium a less refined version of Lithium-6 deuteride, formula ⁶Li²H, or ⁶LiD, the fusion fuel in thermonuclear weapons, was substituted. While naturally occurring lithium contains only 7.5% of the desired ⁶Li²H, the less refined substitute still contained 60% of the more common lithium-7 deuteride, an impurity that while it rendered the catalyst less than perfect, was incorrectly assumed to be inert, and thus benign. The result was an H-Bomb designed to deliver a 6 megaton payload, but which, after the countdown, surprised the nuclear physicists and military brass with a 15 megaton explosion, 2.5 x what they expected. Not only did they nearly vaporize themselves, but they blew a crater in the seafloor of the Bikini Atoll Lagoon so large that it can still be seen from space. The wind also blew the wrong direction that day and 2 days later Japanese fishermen reported being showered with white radioactive ash, which fell like snow from the sky. In addition to being one of the scientific community's biggest blunders, the Castle Bravo test can also be counted as one of the biggest environmental disasters in human history. But that didn't stop them from celebrating.