What Can You Tell Us About That Submarine?

CNN's John Defterios has been working on a documentary about the Cold War. He says he and his colleague Joedes Monigal were tasked with finding out what was going on in northern russia at the time of the war. They found evidence that Russia was building a huge submarine called thetyphoon class, but they couldn't confirm whether it was real or not. The film crew have permission to go on board one remaining typhan glass as part of their investigation.