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A player-created Guide is available for this content: The City of the Tracklayers (Guide)

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ID: 263290

Spoiler warning! This page contains details about Fallen London Actions.

From: Denizens of the Neath

Something has bored a lot of destabilising tunnels through the bedrock of [City Name]. Entirely coincidentally, one Hellworm did escape its GHR handler.

Locked with Train through Parabola exactly 1 (hidden)

Challenge information

Broad, Watchful 150

• 103 - very chancy (41%)
• 128 - chancy (51%)
• 153 - modest (61%)
• 178 - very modest (71%)
• 203 - low-risk (81%)
• 228 - straightforward (91%)
• 250 - straightforward (100%)
  

Narrow, Monstrous Anatomy 7 (50% base)

• 3 and below - almost impossible (10%)
• 4 - high-risk (20%)
• 5 - high-risk (30%)
• 6 - tough (40%)
• 7 - very chancy (50%)
• 8 - chancy (60%)
• 9 - modest (70%)
• 10 - very modest (80%)
• 11 - low-risk (90%)
• 12 and above - straightforward (100%)
  

Success

Make the most of it

First, work out where the worm is and block its avenues of escape. Make sure you use sufficiently heat-proof materials.

Then, either fill in the fresh tunnels, or apply bracing to keep them from caving in. […]

Description summary:
The last paragraph varies on who the current Leader of the Tracklayers is.

Leader	Description
Furnace	Furnace recommends leaving a few, and stockpiling supplies inside. There's no telling what the city might need in the future. If it's ever attacked, or suffering a famine... well, you see her point.
Cornelius	You and Cornelius do discuss their possible other uses […] But in the end, you are forced to agree that they were not very well designed for any of those purposes. The Hellworm should have been given a blueprint in advance.
Fires' Lackey, Your Lackey	You do check whether the Lackey wants to leave any of them open for any purpose, but he's unable to think of a good application. And in truth they weren't laid out with the intention you'd want from, for instance, a sewer system. [...]
January	January encourages leaving a few tunnels in place, with secret entrances, unmarked on any map. As long as there's light in the world, there's a use for dark places.

[Find the rest of the story at https://www.fallenlondon.com]

• Watchful is increasing…
•  Habituated to the Hinterland is increasing… (+1 CP)
•  You've gained (220 + Efficiency) x Hinterland Prosperity

Failure

Know where to fill and when to duck

Filling in the tunnels is the easy part. The difficult part is dodging before a blast of fiery breath comes your way.

• Watchful is increasing…
•  Habituated to the Hinterland is increasing… (+1 CP)
•  The City Waning is increasing… (+4 CP)
•  Wounds is increasing… (+2 CP)
• [Airs of Passengers change…] (random) (hidden)