Daily Dive #80 · Prompt 3 of 7 · October 3, 2026
Krillion answers: “Name a type of structure built underground (man-made)”
Krillion accepted 154 answers for this prompt: 2 One in a Krillion, 83 Deep Cut, 48 Rare, 15 Schooler and 6 Plankton. The 100-point gem starts with “D” — it is listed first below, followed by every other answer from rarest to most common.
One in a Krillion: Denehole. Chalk miners sank a narrow shaft, then hollowed out chambers below.
154 accepted answers
One in a Krillion · 100 pts (2)
- DeneholeChalk miners sank a narrow shaft, then hollowed out chambers below.
- ErdstallA medieval tunnel network with tight squeezes and a still-debated purpose.
Deep Cut · 85 pts (83)
- Archive vault
- Artificial cave
- Auxiliary Units operational base
- Barabara
- Biogas digester
- Canal tunnel
- Catch basin
- Cist
- Cryptoporticus
- Cycling tunnel
- Earth lodge
- Flood tunnel
- Fogou
- Freight tunnel
- Geothermal well
- Ghost station
- Grease trap
- Hiding complex
- Hypocaust
- Hypogeum
- Infiltration gallery
- Inspection pit
- Leach field
- Mikveh
- Mithraeum
- Ore pass
- Piles
- Pit latrine
- Pumped storage cavern
- Qargi
- Qarmaq
- ROC post
- Rock-cut church
- Rock-cut temple
- Rock-cut tomb
- Sardab
- Seismic vault
- Shaft tomb
- Slurry pit
- Soakaway
- Souterrain
- Stepwell
- Stope
- Storage cavern
- Stormwater tank
- Sump
- Sunken courtyard yaodong
- Tram tunnel
- Undercroft
- Underground bus station
- Underground data centre
- Underground factory
- Underground farm
- Underground fortress
- Underground funicular
- Underground garden
- Underground granary
- Underground greenhouse
- Underground hangar
- Underground hospital
- Underground hotel
- Underground magazine
- Underground museum
- Underground nightclub
- Underground postal railway
- Underground power station
- Underground pumping station
- Underground quarry
- Underground railway depot
- Underground reservoir
- Underground school
- Underground sports hall
- Underground storage tank
- Underground street
- Underground submarine base
- Underground substation
- Underground telephone exchange
- Underground warehouse
- Underground water tank
- Utility vault
- Wheelhouse
- Wildlife tunnel
- Winze
Rare · 60 pts (48)
- Aqueduct
- Borehole
- Burial vault
- Cave house
- Cellar dwelling
- Cesspit
- Cistern
- Crawl space
- Culvert
- Dugout
- Earth-sheltered house
- Elevator shaft
- Escape tunnel
- Foundation
- Foxhole
- French drain
- Icehouse
- In-ground pool
- Kiva
- Manhole
- Military tunnel
- Mine tunnel
- Nuclear waste repository
- Oil well
- Ossuary
- Particle accelerator
- Pedestrian tunnel
- Pipeline
- Pit house
- Qanat
- Road tunnel
- Secret tunnelYeah, I forget the next couple of lines, but uh, then it goes
- Seed vault
- Septic tank
- Smuggling tunnel
- Storm drain
- Sub-basement
- Trench
- Tunnel network
- Underground base
- Underground city
- Underground laboratory
- Underground mall
- Underpass
- Underwater tunnel
- Utility tunnel
- Vault
- Ventilation shaft
Schooler · 30 pts (15)
- Bomb shelter
- Catacombs
- Cellar
- Crypt
- Dungeon
- Fallout shelter
- Missile silo
- Railway tunnel
- Root cellar
- Storm cellar
- Subway station
- Tomb
- Underground garage
- Well
- Wine cellar
Plankton · 10 pts (6)
- Basement
- Bunker
- Mine
- Sewer
- Subway
- Tunnel
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