When approaching the Yamantau bunker Sam spies a large bomb crater and says "look at the size of that one, wonder what yield it was?", Idiot replies "looks like a hundred, your guys used to have three and five hundred ones too". By a hundred Idiot means 100 kilotons, which is the average yield of a single SLBM (Submarine Launched Ballistic Missile) warhead. The largest nuclear bomb ever built was the Soviet Union's Tsar Bomba, which had a yield of 58 megatons; the largest bomb built by the United States was the SHRIMP with a yield of 15 megatons. Due to the strategic nuclear reduction treaties both the Soviet Union and the US had dismantled their large megaton yield warheads by the end of the 1990's, as of 2019 the largest nuclear bomb in use by the US is the B-83 thermonuclear gravity bomb carried by the B-2 Spirit stealth bomber, it has a variable yield warhead with a maximum yield of 1.2 megatons. The other weapons in the US nuclear arsenal include the AGM-86 cruise missile (carried by the B-52 Stratofortress) with variable warhead yield of 5-150 kilotons, B-61 thermonuclear gravity bomb (also carried by the B-2 Spirit) with a variable yield of 0.3-400 kilotons, the UGM-133 Trident II SLBM carried by the Ohio-class ballistic missile submarine, each submarine carries 20 of these missiles and each missile can be armed with up to 10 MIRV (Multiple Independent Reentry Vehicle) warheads with yields of either 5, 90, 100 or 450 kilotons per warhead depending on the type. The final weapon in the US nuclear arsenal is the LGM-30 Minuteman III ICBM (Intercontinental Ballistic Missile), the US has 450 of these missiles in stockpile with 100 active missile tubes spread between six Air Force bases across the country, each LGM-30 is armed with either a single W-78 350 kiloton yield warhead or a W-87 475 kiloton yield warhead. Information on current Russian nuclear weapons is hard to come by, but their gravity bomb, cruise missile, ICBM and SLBM missile warhead yields are comparable to the United States'.
