11.   The explosion was used to calibrate equipment at seismic stations around the world to help them monitor future underground explosions.

12.   The mayor of Hiroshima sent a letter to the U.S. Embassy in Tokyo Thursday urging the United States to stop nuclear weapons research that uses explosions.

13.   Theoretically the explosions could be used for energy production or massive construction projects, such as digging canals across deserts.

14.   Wills, who is also chairman of Greenpeace New Zealand, said the United States had admitted it used simultaneous explosions to hide the actual number of weapons tested.