A giant construction worker camp has appeared in recent weeks in a suburb of Pyongyang long thought to house the headquarters of the country’s military industry, likely indicating a new improvement project is underway.

NK Pro analysis of Planet Labs satellite imagery shows the new project began on and near Kangdong Airfield located northeast of the capital in the first days of January, with the camp reaching a size of around 84 acres (34 hectares) by Jan. 30.

The camp resembles others previously set up at 10,000-home skyscraper street projects in the capital and at the “world