Many of the sites are protected, and any operation would have to suppress at least part of Iran's air defences, and all its missiles and naval power, to limit any retaliation.

The cloud (such as water cloud), which is formed by the inert substance suspending in the air, can prevent or suppress flame and shock wave's propagation.

Thus, it is possible to suppress deterioration of the air tightness of a seal member arranged at the boundary between the normal temperature side and the low temperature side for a long period of use.