This is a picture of the Malinta Tunnel, also on Corregidor Island in Manila Bay. Dug into a hill, there's something like 100 ft of rock protecting it from bombardments, and is therefore the place where both the Americans and the Japanese held out until the very end in protecting the Philippines. Now there's a multimedia sound and light experience inside which was pretty unique. They have this one part where they play what sounds like a bombing really loudly over the speakers and the whole place is shaking from the sound. I can't imagine what it was like being in there for bombardment after bombardment!