Castle Bravo 's yield was 15 megatons of TNT , 2.5 times the predicted 6.0 megatons , due to unforeseen additional reactions involving Cause_to_be_included Li , which led to Causation the unexpected radioactive contamination of areas to the east of Bikini Atoll .

Castle Bravo 's yield was 15 megatons of TNT , 2.5 times the predicted 6.0 megatons , due to unforeseen additional reactions involving Cause_to_be_included Li , which led to Causation the unexpected radioactive contamination of areas to the east of Bikini Atoll .

Thermal energy released during the eruption was equal to 26 megatons .