In 1915, the world is in turmoil. A war, the likes of which has never been seen, involves much of the known world. An Englishman, John Norton Griffiths, proposes using miners to tunnel under the enemy lines and destroy them from below. Once his idea is accepted, other countries of the Empire decide to raise similar tunnelling companies. Canada, New Zealand and Australia provide companies of men, drawn from mining and trades backgrounds, to assist...