There were different sections in the ravelin, blocked off with plywood walls...doorways were there, but secured by this super-secure plastic. Wherever there's old, unattended masonry, however, there's usually some water that's been dripping for many years, resulting in tiny stalagtites! When confronted with these formations, I feel it incumbent upon myself to taste the water. So far, in my experience at least, starfort water generally tastes like gritty water.