Now here we have the bomb which was one of the most heaviest and high yield nuclear bombs ever to be made by the United States. The making of Mark-36 was based on a number of thermo nuclear devices and chain reaction designs. It was so powerful that it was easily able to produce a yield of nearly 10 megatons. The estimated weight of the bomb was nearly 1700 pounds or more. What’s more horrifying is the fact that the makers had modified all the previous Mark-21 bombs into the Mark-36 nuclear designs. Furthermore, a number of variants of the bomb were also produced.