This mine has a shaft that breaks to the right about half way down. Please note the word "shaft", because this is very important.
I originally thought this shaft was filled. It appears to be an elevator shaft of some kind and would appear that the uppermost timbers have somewhat collapsed. Combined with the fact that people have possibly thrown timbers, rocks, rubble, etc. into it to block it off, it still appears to exhibit the characteristics that there is still an empty hole that drops straight down. It wouldn't suprise me if it were a deep hole filled with water.
If you go into this mine, please stay out of here. These would have probably been the thoughts of the previous person(s) which urged them to block the shaft so that nobody would fall in, providing somebody actually threw timbers, etc. into this "shaft."