The nuclear threat from North Korea looks greater than ever.
Even as the new U.S. defense secretary warned North Korea on Friday of an "effective and overwhelming" response if the rogue state uses nuclear weapons, images indicate that Pyongyang continues to rapidly build out its missile program — research, development and facilities for storing, launching and testing missiles.
"There's a lot going on. It's not looking good," said David Schmerler, research associate at the James Martin Center for Nonproliferation Studies.
Schmerler is part of a team that analyzes pictures from Google Earth and private satellite imaging firm Planet Labs over time, using propaganda videos and other sources to tip them off on where and how to scrutinize most closely.