Tunguska event - 12 megaton explosion in 1908 over East Siberia, flattened 80 million trees over an area of 2,150 km2 (830 sq mi). Generally attributed to a meteor air burst, no impact crater found.
I watched a Youtube clip recently that mentioned there's a theorised 'island of stability' in transuranic elements around atomic number 160. These ultra-heavy elements would be happy to exist without decaying into lighter elements. It mentioned the asteroid 33 Polyhymnia as a possible Compact Ultra Dense Object because measurements show its average density to be about three times higher than osmium.
Almost in passing, the presenter mentioned that the explosion of a CUDO entering the atmosphere above Tunguska would produce the effect we see.
For example, the 68 km (42 mi)-diameter asteroid 675 Ludmilla was originally measured to have a density of 73.99±15.05 g/cm3 in Carry's study,[5] but improved orbit calculations in 2019 showed that it had a much lower density of 3.99±1.94 g/cm3.[14]
So there is another meteor, which was estimated the same way at the same time as 33 Polyhymnia, and they measured again later and they found it was 20 times less dense...
While it sounds like an interesting theorem this doesn't shine a good light on it. It's also strange that he "forgot" to mention this in the video.
Yes, I watched the video, but he didn't mentioned that there was already a similar meteor where they already remeasured. It lowered a bit my expectations after I looked this up.