Here is the entrance to the crawlspace. While this seems like a normal crawlspace, there are a few causes and symptoms that can be seen. As previously mentioned, the vents on this home were open, which allows moisture to get into the crawlspace. It is also very obvious that there has been a lot of water in this crawlspace, as noted by the old liner being completely covered in mud, as well as a "mud line" a few inches up the wall.