The Wall Street Journal reports that North Korea is allegedly expanding on a military airbase near the east coast city of Wonsan.

The report quoted Curtis Melvin of North Korea Economy Watch as saying that the latest sweep of Google Earth’s satellites show that a full-fledged runway in open view has been built north of another runway that was built nearly a decade ago. The report notes that the older runway appears to go through a mountain.

Melvin noted that the airbase, which KPA Journal publisher Joe Bermudez said is named Kangda-ri, is not far from the cross-country highway that leads to Pyongyang.