Hypogeous [adjective]

● Buried

● Covered

● Hypogeal

● Hypogean

● Subterranean

● Subterrestrial

● Sunken

● Underfoot

● Below ground

● In the recesses

● Hypogeous

● Underground

● Subterranean

● Underground railway

● Hypogeal

● Air shaft

● Storm cellar

● Epigeous

● Cyclone cellar

● Cavernicolous

● Subsurface

● Subterraneous

● Incaverned

● Overground

● Other world

● Envault

● Unburrow

● Stulm

● Fossorial

● Stone pit

● Diaclasis

● Incaved

● Subingression

● Stench trap

● Burial chamber

● Remblai

● Suspiral

● Tower of london

● Earthpea

● Tank farm

● Caponiere

● Natural depression

● Funk hole

● Aboveground

● In secret

● Cesspipe

● Soil pipe

● Rabbit warren

● Rupestrian

● Vadose

● Cavelike

● Catchdrain

● Stational

● Clandestine

● Aquiferous

● Transportation system

● Cavernous

● Backstair

● Water gang

● Gas main

● Concameration

● Fallout shelter

● Atterrate

● Fire trench

● Conditory

● Subway station

● City district

● Devaporation

● Abyssal zone

● Labyrinthic

● Gas system

● Sewage system

● Labyrinthical

● Back passage

● Storm door

● Untrenched

● Deterration

● Geological formation

● Psychrophyte

● Stalactite

● Drainage system

● Bivaulted

● Suillage

● Defensive structure

● Geoscopy

● Labyrinthiform

● Cable railway

● Prison cell

● Secret

● Molecast

● Traphole

● Solonchak

● Movable barrier

● Dungyard

● Bank vault

● Underdelve

● Humicubation

● Foralite

● Waste pipe

● Safe house

● Circumterraneous

● Clancular

● Caliduct

● Fairy circle

● Arenicolite

● Choke damp

● Chresard

● Trench mortar

● Subbasement

● Ablaqueate