In August 1883, something happened between Java and Sumatra that lasted a few hours — and then, for three years, the entire planet watched its consequences in the sky. Fire brigades were called out to sunsets. The sun rose green over India. And a Norwegian painter never forgot what he saw over the fjord. This week you will hear the loudest sound in recorded history, follow a pressure wave around the Earth, raise a 30-metre ocean, and learn to read the sky. OPEN THIS WEEK'S DISCOVERY: https://leventejere-dev.github.io/unseen-sduht0/ Headphones on, lights low, one sitting — about 12 minutes. Every claim is sourced; the closing archive starts with the Royal Society's 1888 report. When you come back: which single detail will you still remember a month from now?