- Leaked Pentagon docs show the shot-down Chinese spy balloon may have had a feature known as 'synthetic aperture radar' that can see through certain materials, WaPo reports. https://www.businessinsider.in/international/news/leaked-pentagon-docs-show-the-shot-down-chinese-spy-balloon-may-have-had-a-feature-known-as-synthetic-aperture-radar-that-can-see-through-certain-materials-wapo-reports/articleshow/99531177.cms 112 comments technology