00:00Double trenches became silent gas chambers.
00:03Roman engineers dug parallel defensive ditches designed specifically to trap enemy tunnel diggers underground.
00:11Infiltrating sappers broke into hidden dead zones where fresh air completely stopped flowing.
00:17Smoldering sulfur fires lit above pumped dense toxic fumes straight down into the trapped pockets.
00:25Asphyxiating gas filled the sealed underground cavities instantly.
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