In January, thousands of North Korean students traveled to Mount Paektu, a sacred site where the ruling family claims its roots and where leader Kim Jong Un is building a massive economic hub in the alpine town of Samjiyon.

It is one of the largest construction initiatives Kim has launched, part of his campaign for a "self-reliant economy" even as he seeks to convince U.S. President Donald Trump to lift economic sanctions at their second summit later this month.

State media painted an inspiring picture of patriotic students braving harsh weather, eating frozen rice, and ignoring supervisors' worries about their health in order to work harder on the huge building site.