Crawlways are narrow passageways that require a person to crawl in order to navigate through them. These passages are often found in underground tunnels, caves, or other confined spaces. Synonyms for crawlways include tunnels, shafts, burrows, narrow passages, channels, conduits, ducts, and subterranean passages. These words describe the same concept of a small and sometimes tight area where one must crawl to get through. No matter which word is used, they all share the same characteristic of being a space that requires one to move in a slow and crouched position.