[TXnMA]

"Take a look at the ridge of hills just north of Pyongyang; they are covered in A-A and riddled with tunnels -- including being pierced by a highway that could serve as a runway."

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The current satellite image of that area is through considerable cloud cover. "Grabbing" the image and enhancing it (gamma and contrast) can overcome the overcast obscuration to a considerable extent...

[TXnMA]

Just zoomed out and took a look at that area. The "overcast" is actually smoke from a huge fire up to the northwest...