The is a photo of a crawl space below a house. During an inspection of an area like this, it would be wise to advise someone present that you will be entering the space in the event you need assistant because you are unable to exit on your own. You can refer to the Confined Space portion of the Safe Practices for Home Inspection Class available bi InterNACHI.
Sh-e-e-et… that’s no crawlspace, that’s a short basement!