I understand what you are trying to do, instead of plexiglass, or chicken wire, go old school. A series of barred grates can be dropped into place. The bars and cross pieces can be no thicker than a rod of rebar, it will hinder movement along the tunnel, while providing a missile Unum of cover and protection from intruders. The fire-control can be programmed to direct the lasers fire to avoid the grates. Certainly it may mean a glancing shot rather than a kill shot, but it will prevent any attempts to emplace demo charges, and if 2-4 lasers are placed, then multiple firing angles can be achieved.
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The reason that the American Army does so well in wartime, is that war is chaos, and the American Army practices chaos on a daily basis.
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