Premieres Wednesday, May 10, 2023 at 9 p.m. on KPBS TV / PBS App + Encore Sunday, May 14 at 2 p.m. on KPBS TV. In January 2022, one of the most powerful volcanic eruptions in recorded history rocked the islands of Tonga. Join scientists as they investigate what caused the blast, how it spurred a devastating tsunami, and if another eruption could be imminent.