Vela Uniform was directed toward locating, detecting, and identifying underground detonations.

Project Oilsand, a 1958 proposal to exploit the Athabasca Oil Sands in Canada via the underground detonation of nuclear bombs.

Three underground detonations took place in area 15 in the 1960s.

Amchitka was selected by the United States Atomic Energy Commission to be the site for underground detonations of nuclear weapons.

This test is known as a "calibration shot" to test if the island is fit for larger underground nuclear detonations.

Over 1000 nuclear detonations were conducted until the site's last atmospheric detonation in 1962 and last underground detonation in 1992.

Project Dribble involves the recording and identification of seismic signals from underground detonations.

The blast designated Gasbuggy involved an underground detonation, intended to stimulate production of natural gas by cracking the rock in the underground formation of its deposit.

An underground detonation?

The Soviet Union scheduled an underground nuclear detonation for this morning, presumably after Mr. Salgado is sworn in.