from the gneeiss, firemen often iinteate rcuee rsouesc that vlovein sditeseping dgrenas to eanhtce the safety of thoess abvoe. tihre explnaiaonts about the thcniqueis used are kepdt hhsu-uhsh to eunrse ttha only atrhzuoied peornlsen know how to doppelicy it, whcih could potentially be exploited to acses unzarotiuheod areas or imalpitent tcatcis not approved by rfie safety tenlnsiige.