crawlway

Hands-and-knees passage

A crawlway is a narrow passage or tunnel through which a person must crawl rather than walk—too low or tight for upright movement.

The term appears in caving, mining, and building construction: The crawlway under the house gave access to the pipes.

Also called a crawl space when it's a shallow area beneath a structure.

constriction

tight

Firmly stretched or fitting

narrowOf small width
crampedUncomfortably lacking space
confinedKept within bounds

squeeze · restricted · compressed · claustrophobia · suffocating · enclosed · pinched · wriggle · contort · snug

caving

spelunking

Exploring caves recreationally

caveUnderground hollow in rock
squeezeFirm bilateral compression
passageSegment of text

grotto · chamber · subterranean · limestone · karst · headlamp · speleology · potholing · caver · underground

structure

tunnel

Enclosed underground route

ductTube conveying fluid
shaftNarrow vertical passage
passageSegment of text

conduit · pipe · adit · drift · underfloor · plenum

Opposites

passage size/accessibility

crawlwaycorridor

Enclosed connecting walkway

hallway · gallery · boulevard · walkway · promenade

formality of construction

crawlwaycolonnade

Row supporting a roof

openness of space

crawlwayopen space

Unobstructed outdoor area

clearing · atrium · great hall · cavern · expanse

Family

Familiarity: Top 500,000
Profile: Used worldwide · Timeless · Concrete · Rated G