11.   On Monday, the nations of the world observe a ban on underground nuclear explosions.

12.   Past test ban accords have been limited, and this one would bar all underground nuclear explosions.

13.   That would be after seven or eight underground explosions, which France says are needed to establish the reliability of a new submarine warhead.

14.   The CIA told the White House on Tuesday that Pakistan could detonate an underground nuclear explosion at any moment.

15.   The computer will be able to simulate the effects of underground nuclear explosions, eliminating the need for actual tests.

16.   The White House was given no warning about the Indian underground explosions.

17.   There are brief allusions to his work at Los Alamos and to his presence at an underground nuclear explosion.

18.   They also produce the really big upsets, ones far bigger than underground nuclear explosions.

19.   This summer, underground explosions and loud airboats have been disturbing the fragile ecosystem of the swamps and marshlands in the Jean Lafitte National Historical Park and Preserve.

20.   Underground nuclear explosions as part of a testing program would be banned under the treaty.