Why was a Trump staffer able to make a secret recording inside the Situation Room?

For a place that most of us will never see firsthand, the White House Situation Room conjures vivid mental images: gleaming high-tech military coordination, late-night strategy meetings with global implications and, most of all, security. It was the place from which top officials directed the 2011 operation against al-Qaida leader Osama Bin Laden. Surely this is the most secure room in the world. At least, it should be.