Apparently North Korea has been teaching Burma how to be shady. Check out this report from Yale Global:

"Missiles and missile and nuclear technology, counterfeiting money and cigarette smuggling, front companies and restaurants in foreign countries, labor export to the Middle East – North Korea has been very innovative when it comes to raising badly needed foreign exchange for the regime in Pyongyang. But there is a less known trade in service that the North Koreans have offered to its foreign clients: expertise in tunneling."

"[The Burmese] military junta has been busy digging in for the long haul – literally. North Korean technicians have helped them construct underground facilities where they can survive any threats from their own people as well as the outside world."