During the 20th century various colonial and later overseas companies looked at the fields but never moved beyond initial exploration.

To date, since its initial exploration and route-finding in the early 1930s, a total of 781 people have died on Tanigawa-dake.

This is usually done by drilling more appraisal wells around the initial exploration well.

Since the initial exploration, they have found a fifth chamber with paintings.

Some initial exploration of his bonds had revealed that he could break them with a little effort.

A large pocket of water had not been noticed during the initial explorations.

"If you will also limit your initial exploration to an hour, this will serve as another safeguard."

His initial explorations were inspired directly by contemporary work and historical precedent.

Unless there's a drop in the area, scuba should be fine for initial exploration.

After initial exploration with a single protein, increasingly complex systems were studied by bio-electrosprays.