Most of today's candidates are hashtag-laden Shorts, so this short documentary from Echoes of Time stands out as a genuine long-form piece. It covers the 2011 Tōhoku earthquake, tsunami, and Fukushima nuclear disaster — a chain of catastrophes that reshaped how the world thinks about seismic risk, coastal engineering, and nuclear safety.

The event is worth understanding in depth. A magnitude 9.1 megathrust rupture off Japan's Pacific coast displaced enough seafloor to send waves over 40 meters high into coastal towns, killing roughly 20,000 people and disabling the cooling systems at the Fukushima Daiichi plant. The subsequent meltdowns of three reactors triggered the most serious nuclear accident since Chernobyl and forced a global reassessment of backup power design, seawall heights, and evacuation zoning.

A well-made retrospective can pull together the geology (why the Japan Trench produces such large slip events), the hydrodynamics (why tsunami waves grow as they approach shore), and the engineering failures (why diesel generators in a basement below sea level were a fatal design choice) into a single coherent picture. Given the channel's focus on historical explainers, this should offer more context than typical news clips.