A ground milling machine, comprising a milling drum, rotatably mounted in a milling-drum housing, for removing ground material, a milled-material conveying apparatus for transporting the removed ground material and a dust extraction apparatus for extracting dust-containing air from a region of the milled-material conveying apparatus, the dust extraction apparatus comprising at least one extraction line, which opens into the region of the milled-material conveying apparatus via an extraction opening, the ground milling machine comprising a left side wall, a right side wall, a front wall and a rear wall, and wherein a maintenance tunnel is provided which is designed such that it establishes an access connection, accessible from outside the ground milling machine, between the extraction opening and one of the side walls, the front wall or the rear wall of the ground milling machine. A method for maintenance of the dust extraction apparatus is also disclosed.