The missile had one W53 warhead with a yield of 9 Megatons (9,000 kilotons). Both RVs contained a W-49 thermonuclear warhead with an explosive yield of 1.44 megatons. A single thermonuclear warhead was carried with a nominal yield of 3 megatons of TNT. Its yield was 3.5 megatons, 85% fusion and only 15% fission. The nuclear explosion had a yield of 2.6 megatons. This program is known as the Megatons to Megawatts Program. The Megatons to Megawatts program came to an end in 2013. It produced a yield of 10.4 megatons of TNT. The 1883 eruption of Krakatoa was the equivalent of roughly 200 megatons. However, it yielded 14.8 megatons, which is the largest nuclear explosion tested by the U.S. Thermal energy released during the eruption was equal to 26 megatons of TNT. Scientists significantly underestimated the size of the bomb, thinking it would yield 5 megatons. It was a three-stage hydrogen bomb with a yield of about 50 megatons. May 18 eruption released 24 megatons of thermal energy; it ejected more than of material. TNT, which is considerably less than earlier W56's 1.2 megatons.