An unknown man, or woman, was living under my house

My brick home is raised slightly and has a crawl space underneath of up to one metre. During an evening of intense winds the wooden door, which is under my bedroom window, was constantly slamming. I went outside and locked it shut. The next day I was hearing knocking. I peaked out my bedroom window to see if anyone was there. I saw nothing. After five days of regular knocking I unlocked that gate just in case. Never heard the knocking again. So, someone was living underneath my home. No signs of life there so I assume they were hiding that night from the insane winds. That could have ended so badly for him.