Footage of largest nuke ever tested declassified by Russia

• The largest nuclear bomb the world had ever seen was detonated by the Soviet Union in 1961.

• The RDS-220 is said to have been a hydrogen bomb that exploded with the force of more than 50 million tons of TNT.

• It is considered to be the largest man-made explosion in the history of mankind.

• A 40 minutes videos containing previously unseen footage of the bomb was declassified by Russia and uploaded it on YouTube.

• The footage is a reminder of the madness of Cold War and the lessons from it that people have seem to forgotten.