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OOOH! A 'spider hole'!
Thats the deluxe spider hole model, the ones I saw at the Cu Chi tunnels last year there would be no way I would fit in one in-fact one idiot egged to go in one did and promptly got stuck it took a fair bit of reefing by others to get him out of it, also my wife and I partook of the 40m underground crawl through part of the tunnel system there its 40% larger than in war time even then your on all 4's with bugger all clearance all round apparently the VN soldiers whom used the system only weighed @40-50 kilo's.