<P> Extensive planning was done by a very small group of scientists, senior military officers and senior politicians to ensure that the test preparations would remain secret, and even senior members of the Indian government didn't know what was going on . The chief scientific adviser and the Director of Defence Research and Development Organisation (DRDO), Dr. Abdul Kalam, and Dr. R. Chidambaram, the Director of the Department of Atomic Energy (DAE), were the chief coordinators of this test planning . The scientists and engineers of the Bhabha Atomic Research Centre (BARC), the Atomic Minerals Directorate for Exploration and Research (AMDER), and the Defence Research and Development Organisation (DRDO) were involved in the nuclear weapon assembly, layout, detonation and obtaining test data . A very small group of senior scientists were involved in the detonation process, all scientists were required to wear army uniforms to preserve the secrecy of the tests . Since 1995, the 58th Engineer Regiment had learned to avoid satellite detection . Work was mostly done during night, and equipment was returned to the original place to give the impression that it was never moved . </P> <P> Bomb shafts were dug under camouflage netting and the dug - out sand was shaped like dunes . Cables for sensors were covered with sand and concealed using native vegetation . Scientists would not depart for Pokhran in groups of two or three . They travelled to destinations other than Pokhran under pseudonyms, and were then transported by the army . Technical staff at the test range wore military uniform, to prevent detection in satellite images . </P> <P> The main technical personnel involved in the operation were: </P> <Ul> <Li> Project Chief Coordinators <Ul> <Li> Dr. A.P.J. Abdul Kalam (later, President of India), Scientific Adviser to the prime minister and Head of the DRDO . </Li> <Li> Dr. R. Chidambaram, Chairman of the Atomic Energy Commission and the Department of Atomic energy . </Li> </Ul> </Li> <Li> Defence Research & Development Organization (DRDO) <Ul> <Li> Dr. K. Santhanam; Director, Test Site Preparations . </Li> </Ul> </Li> <Li> Atomic Minerals Directorate for Exploration and Research <Ul> <Li> Dr. G.R. Dikshitulu; Senior Research Scientist B.S.O.I Group, Nuclear Materials Acquisition </Li> </Ul> </Li> <Li> Bhabha Atomic Research Centre (BARC) <Ul> <Li> Dr. Anil Kakodkar, Director of BARC . </Li> <Li> Dr. Satinder Kumar Sikka, Director; Thermonuclear Weapon Development . </Li> <Li> Dr. M.S. Ramakumar, Director of Nuclear Fuel and Automation Manufacturing Group; Director, Nuclear Component Manufacture . </Li> <Li> Dr. D.D. Sood, Director of Radiochemistry and Isotope Group; Director, Nuclear Materials Acquisition . </Li> <Li> Dr. S.K. Gupta, Solid State Physics and Spectroscopy Group; Director, Device Design & Assessment . </Li> <Li> Dr. G. Govindraj, Associate Director of Electronic and Instrumentation Group; Director, Field Instrumentation . </Li> </Ul> </Li> </Ul>

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