One of the things I find fascinating about Tunguska vs Chelyabinsk is that in one case it took decades of scientific research and multiple theories to settle on what probably caused it, while in the other we have video footage and the actual meteorite.
But there were eyewitnesses to Tunguska despite its remoteness, and somehow I’d never read their reports before.
As for the debate about what caused the Tunguska event: it was clearly something from space, but they never found an impact crater or an actual meteorite, just damaged forest. Plus the scientific expeditions weren’t carried out until years later. Current consensus is that it was a meteor, but it exploded in the air before impact, causing the visible fireball across the sky, intense heat, shock waves, atmospheric disturbances and so on but no crater.