Subterranean used in a sentence

Subterranean in a sentence as an adjective

Is the proper term subterranean or submartian in this case?

Once in a while, I get in a mood to add onto my subterranean underworld and fire it up again.

A subterranean automated wrench platform is a whole 'nother thing.

It's one of the few "untampered" natural subterranean lakes left on Earth and arguably the oldest.

> A secret subterranean heart, tinged with mystery and myth, beats beneath the streets in many of the world’s great cities....

Semi-subterranean dwellings could be ideal and even support crops, once constructed.

We're talking enormous sealed electric bombs, swapped out by automated wrench and jack platforms, then a subterranean battery-storage-and-recharge system.

I've established that there's a market for digging trenches for subterranean cables, and my decision to use teaspoons instead of pneumatic drills and mechanical diggers has no bearing whatsoever on my venture's prospects.

By this standard of evidence, we are also to believe that alien abductions, aspartame-induced brain cancers, and infiltration of the government by subterranean lizard-people are also rampant.

Prompted by the video images, the Triton Alliance initiated approximately 10 diving excursions into the subterranean cavern.