Extraordinary. I assume the conditions in the sump were anaerobic. But here's a funny thing: the helmet right in the middle doesn't look like an M16 or 18. IMHO it looks more like an A-H or even Turkish model.
"Sometimes things that are not true are included in Wikipedia. While at first glance that may appear like a very great problem for Wikipedia, in reality is it not. In fact, it's a good thing." - Wikipedia.