MINE PASSAGE is a term used to describe the underground tunnels and chambers created by miners. A SHAFT (5 letters) is a vertical tunnel that is dug into the ground, usually for mining purposes. An ADIT (4 letters) is an entrance to a mine, usually horizontal, that is used to transport people and materials. A STULM (5 letters) is a type of ADIT that is used to drain water from a mine. Together, these three elements form a MINE PASSAGE, which is a system of tunnels and chambers used to access underground resources.