Wednesday, May 4, 2022 at 9 p.m. and Sunday, May 8 at 2 p.m. on KPBS TV + Sunday, May 8 at 9 p.m. on KPBS 2 / On demand now with PBS Video App. 80 years after the world's largest airship ignited in a giant fireball, newly discovered footage sparks a reinvestigation of what exactly caused the Hindenburg disaster.