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Among the items that were recovered was a 15in knife, a pointed throwing star, grappling irons, shields, kitchen knives and chains, many of which were found hidden in trees.
Whereas some have adhesive stems which cling to the surface, others throw out tendrils like grappling irons to drag themselves upwards, or long shoots that twine around the branches of a host.
It's the microfilm every punter wants to get their hands on, but the walls are formidably high and the wire on top notoriously sharp, so when you're invited to wander in to the yard by the commandant himself, without the need for grappling irons and gelignite, it's an opportunity too good to miss.