The Pakistan Army Corps of Engineers started extensive engineering of the potential test sites sometime in 1979–83.
Several coordinated meetings between civilian Pakistan Atomic Energy Commission (PAEC) and military officials finalized the potential sites and construction started in 1979.
Work completed in 1983 in Chagai and Kirana as the tunnels and testing labs were reported as having been bored, and as being similar in construction to Chagai.

The "Special Development Works"(SDW), a special-purpose engineering unit of Pakistan's military scientists and military engineers was commissioned by Brigadier Muhammad Sarfaraz in 1977.
Responsibility of weapon-test sites and logistics were overseen by the SDW as part of their role in the atomic bomb program.

The Pakistani military engineered the weapon-test sites carefully and had long realized the United States's growing suspicion of  secret military nuclear programs.
All work was completed at night before sunrise and the area cordoned off to tourists.
This was done due to avoid American 'Vela' nuclear monitoring satellites detecting the tests, as well as avoiding the civilian population in the area.
Engineering teams were sent to de-seal, open and clean, the tunnels to keep out wild boars that are found in abundance in the Sargodha region.
After preparations were completed and the tunnels were cleared out, PAEC's Diagnostic Group arrived with laboratory leader Dr. Samar Mubarakmand who came with trailers fitted with supercomputers and diagnostic equipment installed in the vans.
They were followed by the Wah Group Scientists under Dr. Zaman Shaikh and PAEC's Directorate of Technical Development (DTD) under Hafeez Qureshi, with the nuclear device in sub-assembly form.
The device was placed in the weapon-testing labs and monitoring systems were set up with around 20 cables linking various parts of the device with oscillators in diagnostic vans parked near the Kirana Hills.

The device was tested using the push-button technique set in vintage style.
The first test was to see whether the triggering mechanism created the necessary neutrons which would start a fission chain-reaction in the actual device.
However, when the button was pushed, most of the wires connecting the device to the oscillators were severed due to errors committed in the preparation of the cables.
At first, it was thought that the device had malfunctioned but closer scrutiny of two of the oscillators confirmed that the neutrons had indeed come out and a chain-reaction had taken place.
The Pakistan Army Corps of Engineers started extensive engineering of the potential test sites sometime in 1979–83. Several coordinated meetings between civilian Pakistan Atomic Energy Commission (PAEC) and military officials finalized the potential sites and construction started in 1979. Work completed in 1983 in Chagai and Kirana as the tunnels and testing labs were reported as having been bored, and as being similar in construction to Chagai.
The "Special Development Works"(SDW), a special-purpose engineering unit of Pakistan's military scientists and military engineers was commissioned by Brigadier Muhammad Sarfaraz in 1977. Responsibility of weapon-test sites and logistics were overseen by the SDW as part of their role in the atomic bomb program.
The Pakistani military engineered the weapon-test sites carefully and had long realized the United States's growing suspicion of  secret military nuclear programs. All work was completed at night before sunrise and the area cordoned off to tourists. This was done due to avoid American 'Vela' nuclear monitoring satellites detecting the tests, as well as avoiding the civilian population in the area. Engineering teams were sent to de-seal, open and clean, the tunnels to keep out wild boars that are found in abundance in the Sargodha region. After preparations were completed and the tunnels were cleared out, PAEC's Diagnostic Group arrived with laboratory leader Dr. Samar Mubarakmand who came with trailers fitted with supercomputers and diagnostic equipment installed in the vans. They were followed by the Wah Group Scientists under Dr. Zaman Shaikh and PAEC's Directorate of Technical Development (DTD) under Hafeez Qureshi, with the nuclear device in sub-assembly form. The device was placed in the weapon-testing labs and monitoring systems were set up with around 20 cables linking various parts of the device with oscillators in diagnostic vans parked near the Kirana Hills.
The device was tested using the push-button technique set in vintage style. The first test was to see whether the triggering mechanism created the necessary neutrons which would start a fission chain-reaction in the actual device. However, when the button was pushed, most of the wires connecting the device to the oscillators were severed due to errors committed in the preparation of the cables. At first, it was thought that the device had malfunctioned but closer scrutiny of two of the oscillators confirmed that the neutrons had indeed come out and a chain-reaction had taken place.
Kirana Hills