MineArchiveThe Ankh-Morpork Dwarf Mines
Fictional record. This page describes a mine from a fictional setting, not a real place. Information is based on the cited canon, with adaptations and interpretation distinguished where necessary. It is kept separate from the real MineArchive corpus — see Fictional.
| Setting | Discworld (Terry Pratchett) |
|---|---|
| Location | Beneath the streets of Ankh-Morpork itself, not in any distant mountain range — the tunnels are described as extending far enough to reach private cellars, including Commander Vimes's own home. No named district or single entrance is given; the text refers to it simply as 'the mine' or 'the mines under the city'. |
| Extent | A tunnel network extensive enough to run beneath much of the city and connect to residential cellars; no map, depth or total extent is given in the text. |
| Controlled by | Grag Hamcrusher (Until his death during the events of Thud!), City of Ankh-Morpork (From the end of Thud! onward) |
| Status | Researched |
Overview
An unnamed, extensive dwarf mine complex running beneath Ankh-Morpork itself — not a commodity mine so far as the story shows, but the physical and political stage for a murder investigation that turns on dwarf religious law, a recording of the Disc's most famous historical lie, and the true story of the battle every dwarf and troll on the Disc had been taught to hate each other over.
History
Ankh-Morpork's dwarf community had already been established in the city for generations by the time of Thud!, but the specific tunnels at the centre of the novel are shown being actively and secretly extended by 'Deep-Downer' dwarfs — traditionalists opposed to modern, surface-friendly dwarf culture — reaching as far as private cellars including Vimes's own. The trigger for the plot is the murder of Grag Hamcrusher, a dwarf demagogue preaching renewed hatred of trolls ahead of the anniversary of the Battle of Koom Valley. Investigating it, Commander Vimes descends into the mine and finds four more dwarfs already dead in a disused tunnel, killed for having heard a 'talking cube' — a recording device holding the voice of the ancient king B'hrian Bloodaxe, found at the bottom of a well belonging to Methodia Rascal, painter of the Disc's iconic depiction of the battle. According to secondary summaries of the novel, the cube's recording undercuts the official version of Koom Valley as a battle at all; Hamcrusher, enraged, tried to destroy it, and another grag killed him in turn for the graver crime, in dwarf law, of destroying recorded truth. The climax moves the story out of the mine entirely, to Koom Valley itself, where Vimes finds the real history: the ancient dwarf and troll kings had gone there to make peace, not war, and a flash flood and mutual ambush in fog killed the peacemaking parties of both sides together in a cavern, the 'battle' being an invention grown up afterward.
Workings
Described only as an extensive network of tunnels and chambers under the city streets, communicated through minesign — a system the text calls 'a sort of vote-by-graffiti for a mine's general mood', including specific signs such as the Following Dark and the Summoning Dark, the most dangerous of them, associated with a quasi-demonic force said to punish dwarfs guilty of wrongs seen by other dwarfs. Grags — dwarf religious authorities — are shown dispensing rulings from within the mine. No commodity, ore or mineral is ever described as being extracted there in the sources checked for this record; whatever their name implies, these mines are the site of dwarf settlement, law and secrecy in the story, not of extraction.
What became of it
By the end of Thud!, the mines pass into the ownership of the city of Ankh-Morpork itself, per the resolution in which Captain Carrot shows Lord Vetinari the network now under civic control. Some equipment abandoned by the Deep-Downers is separately confiscated by Vetinari under a claimed right of eminent domain.
Canon & adaptations
A widely repeated piece of reader commentary treats this mine network as the origin of 'the Undertaking', the underground project named in the later novel Raising Steam (2013) — but Thud! itself never uses that name for it; one close chapter-by-chapter recap explicitly flags the name as something the location 'will later be called', i.e. established only afterward, not here. Independent reader discussion of Raising Steam further indicates that book's actual Undertaking is a goblin-built underground network, distinct from these dwarf-dug tunnels — so the two are not confirmed to be the same thing, and this record does not treat them as such.
Related fictional records
Recorded claims
Each claim is marked with its basis — explicit canon, MineArchive inference, adaptation only, or fandom interpretation — and attached to the source(s) below. Where tellings disagree, both are kept.
- The dwarf mines run beneath Ankh-Morpork's streets and extend into private cellars, including Commander Vimes's own home. (explicit canon) 1
- Grag Hamcrusher, a dwarf demagogue, is murdered; four more dwarfs are separately found killed in a disused mine tunnel, apparently for having heard a recording that undercut the official history of the Battle of Koom Valley. (explicit canon) 1
- Dwarfs communicate within the mine through minesign, described as 'a sort of vote-by-graffiti for a mine's general mood', including the Following Dark and Summoning Dark signs. (explicit canon) 1
- By the end of the novel the mines pass into the ownership of the city of Ankh-Morpork. (explicit canon) 1
- Thud! never names this mine network 'the Undertaking' — that name is applied only in the later novel Raising Steam, and independent reader discussion of that book indicates its Undertaking is a separate, goblin-built project rather than a continuation of these dwarf-dug tunnels. (MineArchive inference, uncertain) 2,3
Sources
- (primary canon) Thud! — Terry Pratchett, 2005 (Discworld #34)
- (interpretation) Terry Pratchett Book Club: Thud!, Parts I-IV — Reactor (formerly Tor.com)
- (interpretation) Reader/reviewer analysis of Raising Steam's 'Undertaking' vs Thud!'s dwarf mines — Aggregated secondary discussion (forums, reviews)
Record created: 25 August 2026 · Last researched: 25 August 2026