1.   As a matter of fact, he and Richwerger are longtime rivals in the subterranean world of revenue estimates.

2.   According to many Indian creation accounts, natives have always lived in the Americas after emerging onto the surface of the earth from a subterranean world of spirits.

3.   They tend to flourish in areas of extreme heat and pressure, as in the subterranean world.

4.   They surely must have been taken by surprise when Pete the Septic Man and Jim the Dozer Guy shook the earth and turned their subterranean world upside-down.