A 2018 NASA workshop put the 1908 Tunguska blast at 10-20 megatons at 10 km. A 2025 paper traces its 80 million trees figure to an unsourced 1930s guess.
Lord Mersey's report of July 30, 1912, blamed excessive speed; Senator William Alden Smith's May 28 speech named Captain Smith's "overconfidence and neglect."