On August 27, 1883, the volcanic island of Krakatoa in Indonesia's Sunda Strait exploded with a force equivalent to 200 megatons of TNT. The blast, audible 4,800 kilometers away in Mauritius, produced tsunamis up to 37 meters high that killed over 36,000 people across Java and Sumatra. Ejected sulfur dioxide aerosols lowered global temperatures by approximately 0.5 degrees Celsius for five years. Atmospheric ash produced vivid red sunsets worldwide, inspiring artists and prompting early scientific study of volcanic climate forcing.