Iran has reportedly laid about a dozen mines in the critical shipping route of the Strait of Hormuz as the war in the Middle East continues to escalate. Andrew Chang explains what we know about Iran's arsenal, and why underwater mines can be so devastating and difficult to remove. Intro: 00:00 Mining the Strait: 01:40 War through fear: 07:22 Images provided by The Canadian Press, Reuters, Adobe Stock and Getty Images »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS For