Escape artist. I need help!!!

[suz1000]

My Savannah Monitor escaped! I put him in my restroom while cleaning his habitat and he escaped. He dug his way between the sheetrock and the floor level wall vent and got into the crawl space. My crawl space covers the entire length and with of my house and I'm not quite sure how to get him out. I live in New Mexico and winter is almost on us. I'm afraid he won't survive it if I don't find him. The temp in my crawl space is about 65 degrees and stays that way all year long. (it is extremely dry under there since I live in the desert) Help!!!!