I am sorry, but you can not actually answer this question, because there are many tunnels in RuneScape. Especially for members there are a lot. There are also different keys, for different places and different quests.
You kill chaos Dwarves there I think, and they drop the key.
in safari zone under ground in a tunnel but you will have to open a door with specific key called sacred key its very difficuilt good luck finding that key hidden somwhere in kanto at digglet tunnel
If it's to do with Dungeoneering, Find a door with the matching shape and colour.
sorry you cant make keys on runescape unless of corse it is the crystsal key.
you go under ground from a tunnel around it
After you get the basement key, you go into the tunnel that is under Goldenrod City and you go to the end of the branching off hallway. There, there is a locked door, where you use the basement key and the door opens, if you get all the way to the end of the tunnel behind the door, you find the director there.
There isn't a key for it unfortunately.
A brass key.
you can find sinebeam trees in Daemonheim on runescape
There is a tunnel like entrance somewhere around the building if it's not near the building look nearby it, you should be able to find it, it's not that hard to spot.
lets, see. My best suggestion is druids which are located in the edgeville tunnel
Buy it, get it from the Hill giants.