Some have blamed K-27's Capt Pavel Leonov over the accident, but CWO Mazurenko says the captain faced a life-or-death choice.

BBC: Eyewitness: Tragedy of Soviet nuclear submarine K-27

As the sub approached, the base's command fled the dockside, because special radiation alarms onshore were emitting a deafening roar, CWO Mazurenko recalled.

BBC: Eyewitness: Tragedy of Soviet nuclear submarine K-27

But two hours later, some crewmen came out of the fourth compartment - and some of them had to be carried, because they could not walk, CWO Mazurenko said.

BBC: Eyewitness: Tragedy of Soviet nuclear submarine K-27

Drawing on research from the U.S. Navy, the opinions of noted psychologists, and on his own experience, CWO Mario Vittone tells us why yelling at recruits is valuable, why stress and fear have a place in the classroom, and why asking for more than is humanly possible sometimes makes everyone safer and more effective.

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