Nuclear Bunker Buster - Criticism

Criticism

The main criticisms of nuclear bunker busters regard fallout and nuclear proliferation. The purpose of an earth-penetrating nuclear bunker buster is to reduce the required yield needed to ensure the destruction of the target by coupling the explosion to the ground, yielding a shock wave similar to an earthquake. For example, the United States retired the B-53 warhead, with a yield of 9 megatons, because the B-61 Mod 11 could attack similar targets with much lower yield (400 kilotons), due to the latter's superior ground penetration. Thus the fallout of a B-61 Mod 11 would likely be less than that of a B-53. Supporters note that this is one of the reasons nuclear bunker busters should be developed. Critics claim that developing new nuclear weapons sends a proliferating message to non-nuclear powers, undermining non-proliferation efforts.

Critics also worry that the existence of lower-yield nuclear weapons for relatively limited tactical purposes will lower the threshold for their actual use, thus blurring the sharp line between conventional weapons intended for use and weapons of mass destruction intended only for hypothetical deterrence and increasing the risk of escalation to higher-yield nuclear weapons.

Fallout from any nuclear detonation is increased with proximity to the ground. While a megaton-class yield will inevitably throw up many tons of (newly) radioactive debris, which falls back to the earth as fallout, critics contend that despite their relatively minuscule explosive yield, nuclear bunker busters create more fallout per kiloton yield. Also, because of the subsurface detonation, radioactive debris may contaminate the local groundwater.

The Union of Concerned Scientists advocacy group points out that, at the Nevada Test Site, the depth required to contain fallout from an average-yield nuclear test was over 100 meters, depending upon the weapon's yield. They contend that it is improbable that penetrators could be made to burrow so deeply. With yields between 0.3 and 340 kilotons, they argue, it is unlikely the blast would be completely contained.

Another criticism is that bunkers can be built at greater depth to make them more difficult to reach. The target's vulnerability is then limited to openings like the ventilation system, which are susceptible to conventional explosives. Proponents of nuclear bunker busters respond that deeper bunkers entail higher costs, limiting the potential enemies who can withstand nuclear bunker busters.

Politically, as well, such nuclear bunker busters are unpopular. Most targets are near cities, critics argue, and even minimal fallout will inflict unacceptable levels of collateral damage. Furthermore, they state, the testing of new nuclear weapons would be prohibited by the proposed Comprehensive Test Ban Treaty. Although Congress refused to ratify the CTBT in 1999, the United States has adhered to the spirit of the treaty by maintaining a moratorium on nuclear testing since 1992.

Finally, the need to use nuclear weapons in this role is questioned by critics. They argue that conventional ground-penetration weapons are able to destroy enough buried or strengthened sites to lessen or even remove the need to use nuclear technology. Other conventional weapons such as thermobaric weapons have proven effective in defeating buried targets that haven't been hardened.