To reach Russia's untapped oil, and maintain production growth and downward pressure on world prices, geologists will be venturing into more remote and improbable landscapes.

Foreign investors are showing interest in Mozambique's untapped oil and gas reserves, and titanium mining is a growing source of revenue.

It would add proven reserves of untapped oil and gas estimated at 573 million barrels, increasing ARCO's total reserves by 14 percent.

That increase leaves only one OPEC member, Saudi Arabia, with large amounts of untapped oil.

Canada and Alaska offer enormous, undeveloped natural gas reserves, and the Gulf of Mexico holds huge, untapped oil and gas deposits.

Offshore drillers plan to go deeper than ever before to find untapped oil and gas reserves.

Mexico, sitting on huge pools of untapped oil, has to import nearly a quarter of its gasoline from the United States.

Officially, reserves stand at more than 100 billion barrels, more than a tenth of the world's untapped oil.

Cyprus is considering Algeria as a potential partner to assist with extracting untapped oil and gas from the island's exclusive economic zone.

British spy Finn McMissile infiltrates the world's largest untapped oil reserves, owned by a group of "lemon" cars.