Dungeon Info (Tunnels)
The Dungeon Info (Tunnels) panel belongs to Rust's train tunnel entrances. Rust's map generator links these entrances with the underground train tunnels, which sit on a grid. The panel shows when you select a tunnel entrance prefab.
The panel has no fields to edit. It has one button, Snap to Tunnel Grid. Click it to move the entrance onto the tunnel grid's steps and turn it to the nearest quarter turn. The move is an undo step.
An entrance that brings its own terrain with it, as a monument does, snaps by itself each time you move or turn it.
A monument of Rust's with a tunnel entrance in it has its own button for this: see Monument Info.
Can edit several selected objects at once.