You may notice that I don’t have much in the way of the actual tunnels. One way of looking at it is that it is difficult to take photos while crawling on your hands and knees through a claustrophobically small space that simultaneously feels like an oven. Another, more enlightened viewpoint is that the other things we saw on our hour-long walking tour were more interesting. The bombs, for example. And especially the booby traps.
Needless to say, war is such a crazy, crazy thing, twisting humanity like a wet rag, wringing out all forms of odd and cruel genius.
House of Hao's 
I just went through the tunnels myself, and will definitely back you up in saying that photography was NOT my first priority crawling through those tiny passageways!