At 28.40 in the video the narrator says "and when a B-52 with four 50 megaton bombs crashes". The US never made a 50 megaton bomb. Some early test bombs accidentally yielded above 10 megatons but most US bombs were under 2 megatons. Not saying a 2 megaton bomb could not ruin your day. The Soviets dropped a 50 megaton bomb. It was found to be overly destructive. H-bombs do not have any theoretical limit to their yield, yet they have a practical one.