With monstrous plumes bursting from the water and shimmery streaks of electric light, Devon Massyn said it was one of the craziest things he has ever experienced.

The Axial Seamount – located hundreds of miles off the coast of Oregon and nearly 5,000 feet below the Pacific Ocean’s waves – erupted in April 2015, spewing a mile’s worth of lava onto the sea floor.

Quirks and Quarks19:09The aftermath of a record-smashing volcano: Hunga Tonga–Hunga Haʻapai two years later It was a record-breaking blast that swept the world — several times over, as it turns out. A ...