and secondary modules were placed into the same compartment to maximize the directional scattering of X-rays. The vast amounts of energy from the initial atomic initiation were transferred in the form of X-rays, which were directed in such a way that they would provide all the required energy to initiate the thermonuclear charge. The technical specifications for the bomb design were completed by 3 February 1955 but were continuously reevaluated and improved up until RDS-37 was delivered to the test site in Semipalatinsk. It was during this time that KB-11 found that they could use lithium–deuterium as a thermonuclear fuel to replace the deuterium–tritium fuel that was decided upon after publication of the Teller–Ulam tests. Several factors had to be overcome by Design Bureau 11 in implementing the idea of atomic compression. The main problems dealt with the massive amounts of radiation that would be emitted from the initial atomic bomb implosion. The calculated yields were large enough that there was much concern whether or not a structure could be engineered to house and hold the energy emission. The next big obstacle to overcome dealt with converting the vast amounts of radiant energy into mechanical energy that would be used to compress the main body. In a report written by Yakov Borisovich Zel'dovich and Andrei Sakharov, it was stated that the new principle of atomic compression as seen in the RDS-37 was a "shining example of creative teamwork". The report went on further to boast enormous amounts of design-oriented, experimental, and technological efforts carried out under the supervision of Design Bureau 11's chief designer, Yulii Borisovich Khariton. The RDS-37 was assembled as an air-deliverable bomb and during testing, was dropped from an aircraft. In its initial testing phase, the bomb's energy yield was reduced out of a safety concern. The lithium deuteride fusion cell was modified to replace some fusion fuel with a passive material. Test aftermath RDS-37 was detonated at the Semipalatinsk test site on 22 November 1955. Despite this reduction in yield, much of its shock wave was focused back downward at the ground unexpectedly because the weapon detonated under an inversion layer, causing a trench to collapse on a group of soldiers, killing one. It also caused a building in Kurchatov, away, to collapse killing a young girl. A group of forty two individuals in Kurchatov were also recorded as having been injured from glass fragments caused