I was stationed at Yokota in the mid 90's. We kept those tunnels sealed except for one entrance that was able to be opened. I believe that they were used on occasion for training, or at least the parts that had been cleared had been were. Someone told me that there were sections booby trapped with high explosives which is why they were sealed so tight. I never went down there though even though I knew were the entrance was and probably could have gotten my hands on the keys if I really had wanted to. I did remember them finding two old US Bombs when we were paving the flight line as well, seem to remember the wash stand for cleaning C-130's had to be sealed off after finding unexploded ordinance beneath it.
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