The ones I informed the captain I was able to discern by detecting subterranean activity.

In that respect the world terrified her, there was too much subterranean activity; too much hidden from public view.

The sand seemed to boil with subterranean activity.

The push to improve ground-penetrating weapons began after the Persian Gulf war of 1991 revealed Iraq's subterranean activities.

Some megapode species bury their eggs in sandy pits dug where sunlight, subterranean volcanic activity, or decaying tree roots will warm the eggs.

"One of the unintended effects of this new visibility is a growth in some of these subterranean activities," said Kenneth Gross, a Washington lawyer who specializes in election law.

Continual microtremors from the subterranean activities made a hash of any attempt at fine monitoring.

Other areas of notable subterranean activity occur primarily along the county's well-established stream and creek beds, where incisions into the surrounding rock faces have allowed for increased drainage and erosion.

"This is a subterranean economic activity," said Michael Kelly, one of the priests' lawyers.

What kind of subterranean activity could cause volcanoes remained a mystery.