This looks very far inland, like its near Jiuquan in the Mongolian desert which is where China's manned space missions fly from
Forget any Area51 UFO conspiracies, its not the answer
I don't have google earth but it could be China's testing out SSTO platform like their version of NASA's X-38....which of course could be totally peaceful or it could have military applications like launching hypersonic missiles from space
Nothing got to do with the Varyag, that is near the ocean
that was a Soviet Carrier Chinese bought over the internet from the cash strapped Russians and now China uses it to train the PLAN boys a few Navy tricks. China still hasn't built a Carrier... yet. They don't invest much in their navy so far but they are investing in space tech
A building with a hole in it sounds like a disguised ICBM silo, maybe it hides a few sams to protect their airfield
during the coldwar people had the idea to hide ICBMs in buildings, train carraiges, you name it if a missile could fit in it then it became a launch site