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The investigation into the drillhole leak in the Soyuz capsule docked to ISS has revealed that it had to have been done after the capsule was fully assembled.
“During the analysis of those images, traces of drilling were found on the anti-meteorite shield,” the source said, adding that “the top of the drill came through the pressure hull and hit the non-gastight outer shell.”
According to another industry source, the non-gastight anti-meteorite protection is installed right before the spacecraft is taken to the final assembly workshop. “When Soyuz MS-09 has just arrived to the final assembly workshop, it was photographed in details. No hole and no signs of drilling… were found. The spacecraft was drilled later, when it was fully assembled,” the source said. He added that the anti-meteorite shield was also photographed before being installed, and no traces on it were found as well.
The source suggested that the spacecraft could be damaged either during the very last stage of works or during its 90-day stay in the checkout stand, adding that it was highly unlikely that the damage occurred during the transportation to the Baikonur space center in Kazakhstan or at the launch facility.
This narrowing of the time frame for the drilling will increase the chances that the Russians will be able to identify who did.