It will be a long wait until 33 miners trapped deep in a Chilean mine will be free — experts say it could take up to four months before a big enough hole can be drilled to allow them to escape. But the fact that they have established contact with the outside world and are now receiving food and water could help them maintain their mental health. "You have to try to maintain human contact, try to instill hope, and keep them informed as to what's happening," said William Dubin, interim chair of psychiatry at Temple's School of Medicine.