crawlway
/ˈkrɔlˌweɪ/
noun
- A narrow passage or tunnel that is only large enough for a person to crawl through, often used for access in buildings, caves, or machinery spaces.
- The plumber had to squeeze through a dark crawlway under the house to reach the leaky pipe.
- The spaceship's maintenance crawlway was so tight that only the smallest crew member could fit inside.
- In the old mine, the miners used a narrow crawlway to reach the deepest tunnels.