Sleep Stories for Adults

From a hemp rope dropped over a ship's rail in 1875 to autonomous robots tracing sonar beams across the seafloor, this episode follows the slow, meticulous science of measuring the deepest place on Earth — the Mariana Trench in the western Pacific, nearly eleven kilometres down. A quiet journey through the history of depth-sounding technology, the 1960 dive to the very bottom, and what the maps made over 150 years tell us about how our planet is built.

In 1970, Soviet geologists began drilling straight down into the Kola Peninsula — no ore, no oil, just science and curiosity. Over twenty-four years they reached 12,262 metres, deeper than anyone has ever drilled. What they found along the way rewrote what we thought we knew about the Earth beneath our feet.

Beneath the Greenland ice sheet lie more than 100,000 years of compressed snowfall — each layer a thin record of ancient atmosphere, volcanic dust, and shifting climate. This episode follows the slow work of ice-core science: the drilling, the counting of annual bands, the chemistry locked inside trapped air bubbles. Ideal for winding down. Steady, unhurried, documentary-style.