▁ ▁R impl as ▁was ▁accessed ▁by ▁a ▁single - c able ▁aer ial ▁tram ▁with ▁a ▁length ▁of ▁ ▁and ▁a ▁rise ▁of ▁, ▁leading ▁directly ▁into ▁its ▁own ▁entrance ▁block . ▁The ▁under ground ▁gall eries ▁were ▁unus ually ▁laid ▁out ▁on ▁two ▁levels , ▁with ▁am mun ition ▁on ▁the ▁lower ▁level ▁and ▁accommod ations ▁on ▁the ▁upper . ▁ ▁R impl as ▁was ▁associated ▁with ▁the ▁following ▁avant - post es : ▁ ▁Val ab res ▁Nord ▁( Pr incipal ), ▁built ▁ 1 9 3 2 ▁along ▁the ▁T in ée ▁road ▁beyond ▁F ress iné a ▁ ▁with ▁three ▁blocks ▁and ▁ 2 0 ▁men . ▁Block ▁ 1 , ▁entry , ▁Block ▁ 2 , ▁along ▁the ▁road ▁with ▁one ▁Par mat ▁clo che ▁containing ▁a ▁machine ▁gun , ▁and ▁Block ▁ 3 , ▁a ▁machine ▁gun ▁cas em ate . ▁Small ▁gall eries ▁extend ▁under ▁the ▁road , ▁and ▁a ▁small , ▁separate ▁block ▁called ▁Val ab res ▁Sud ▁covers ▁what ▁was ▁once ▁a ▁side ▁road ▁( now ▁the ▁main ▁road ) ▁with ▁a ▁g arrison ▁of ▁ 1 7 ▁men ▁and ▁a ▁machine ▁gun . ▁Seven ▁small ▁observation ▁posts ▁reported ▁to ▁R impl as , ▁including ▁C aire - G ros , ▁Pin é a , ▁Fra cc ia - R oure ▁Haut ▁and ▁Fra cc ia - R oure ▁Bas . ▁ ▁History ▁R impl as ▁took ▁a ▁small ▁part ▁in ▁France ' s ▁resistance ▁to ▁the ▁Italian ▁invasion ▁of ▁France ▁in ▁June