On the one hand, the reality of widespread fallout requires that people be carefully informed about the nature of fallout and the dangers of radiation. It requires openness and free discussion. On the other hand there is the overwhelming desire for secrecy and the perceived need to build up nuclear arsenals come what may. In this mindset, it is no wonder that the health and security of one's own citizens is sacrificed at the alter of geo-political considerations. Except for at very high doses, radiation damage is not immediately apparent.
Considerable damage is done to health and the environment before the public becomes aware.
Most bombs have four to five kilogrammes of plutonium of which one can safely assume that more than half is left behind. Plutonium is one of the most toxic substances known. It has a half life of 24,000 years and would thus remain in the environment of Pokhran essentially for ever. Sometimes underground tests result in quick, massive releases into the atmosphere called ventings. Releases which take place slowly over a period of months or years are called seeps.