When Krakatoa erupted in 1893, it obliterated more than half of the island’s landmass, created 100-foot-tall tsunamis, and deafened anyone it didn’t kill for miles around. The death toll was over 36,000. Zanzibar beachgoers discovered washed-up human skeletons melted onto slabs of pumice as long as nine months afterward. Even thousands of miles away, in New Guinea and parts of Australia, the blast was said to sound like gunfire. Its total power amounted to 200 megatons of TNT, or 13,000 Little Boy atomic bombs.