Back in my early days of occasionally doing things with less intelligence I was inspecting a house that turned out to have three different crawl spaces. The house was a long ramble with a middle crawl space and then a crawl space on the east and west sides of the middle crawl space. There was a hatch for the west crawl space, and I traversed that one. There was a hatch for east crawl space, and I traversed that one. While in the east crawl space I noticed that the access to the middle crawl space was a tunnel dug out under the foundation between the east and middle crawl space. Being more in the action mode then the thinking mode I went through. Now to go through it turns out you have to lay on your back and push yourself through with your legs and then you slide up the tunnel into the middle crawl space. Mission accomplished, only issue is that is the only way out, so the same process had to occur to get out of the crawl space. This short story is written for all you claustrophobic people. All three crawl spaces were about 18 inches high.
Don’t want to crawl down there yourself? Hire an inspector. 🙂