SAN JOSE MINE, Chile — Thirty-three men stuck far underground are now the longest-trapped miners in recent history as a huge drill begins digging a planned escape route.

The men were trapped Aug. 5 when a landslide blocked the shaft down into the San Jose copper and gold mine in northern Chile's Atacama Desert. Last year, three miners survived 25 days trapped in a flooded mine in southern China, and the Chileans surpassed that mark today.

While doubts and extreme challenges remain, experts said rescuers have the tools to get the job done — though the government still says it will take three to four months to reach the miners.

"The drill operators have the best equipment available internationally," said Dave Feickert, director of KiaOra, a mine safety consulting firm in New Zealand that has worked extensively with China's government to improve dangerous mines there.

The 31-ton drill made a shallow, preliminary test hole today in the solid rock it must bore through, the first step in the weeklong digging of a "pilot hole" to guide the way for the rescue. Later the drill will be outfitted with larger bits to gradually expand the hole and make it big enough so the men can be pulled out one by one.

Before rescuers dug small bore holes down to the miners' emergency shelter, the men survived 17 days without contact with the outside world by rationing a 48-hour supply of food and digging for water in the ground.