The United States has several simulators that could be modified to emulate the EMP effect of a high-altitude nuclear blast.

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But there should be no confusion, the shot of Bruce at the cafe comes amid a montage of scenes showing each person close to Bruce finding out a bit of information revealing Bruce survived the nuclear blast.

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His decision to ban all nuclear tests would preclude the U.S. from conducting even extremely low-yield tests (for example, those that produce as little of a blast as the equivalent of four pounds of high explosive) as part of the nuclear stockpile stewardship program.

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It has a blast-proof floor, armour-plated glass and was thought to be chemical, biological and nuclear-proof.

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More recently, a meteor exploded over the steppes of southwestern Russia on February 15, a blast that scientists at Canada's University of Western Ontario estimated had the energy of about 30 early nuclear bombs.

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