Missing Cold War nuclear bomb remains a mystery after Canadian navy investigates object found by diver

A Cold War nuclear bomb is still missing after it turned out a diver's underwater discovery was not the atomic weapon weapon as first thought. 

The mystery of a "missing nuke" in Canada has baffled historians for more than half a century. 

Ever since an American B-36 Bomber crashed near British Columbia during a secret training mission in 1950, the nuclear bomb on boardhas never been found.