rid ors ▁at ▁each ▁end ▁of ▁the ▁building . ▁These ▁are ▁formed ▁from ▁internal ▁bl ast ▁walls ▁which ▁turn ▁ 9 0 ▁degrees ▁into ▁the ▁main ▁internal ▁space ▁of ▁the ▁shelter . ▁The ▁floor ▁of ▁the ▁internal ▁space ▁is ▁bare ▁ground ▁and ▁some ▁gra ff iti ▁has ▁been ▁applied ▁to ▁the ▁internal ▁walls ▁over ▁time . ▁It ▁has ▁an ▁internal ▁height ▁of ▁approximately ▁. ▁ ▁The ▁rein for ced ▁concrete ▁walls ▁and ▁roof ▁are ▁approximately ▁ ▁thick ▁and ▁ ▁thick ▁respectively ▁and ▁have ▁an ▁off - form ▁finish ▁to ▁both ▁interior ▁and ▁exterior ▁faces . ▁The ▁roof ▁is ▁flush ▁with ▁the ▁walls ▁and ▁tap ers ▁to ▁the ▁outer ▁edges . ▁Ele ven ▁dog - leg ged ▁vent ilation ▁sl ots ▁are ▁located ▁along ▁both ▁the ▁eastern ▁and ▁western ▁elev ations . ▁The ▁southern - ▁most ▁access ▁cor rid or ▁has ▁been ▁se aled ▁with ▁a ▁recent ▁solid - core ▁door ▁and ▁the ▁northern - most ▁cor rid or , ▁accessed ▁via ▁two ▁concrete ▁steps ▁down ▁to ▁the ▁shelter , ▁has ▁been ▁closed ▁off ▁with ▁a ▁recent ▁gal van ised ▁steel ▁security ▁gate . ▁ ▁The ▁shelter ▁is ▁surrounded ▁by ▁a ▁maintained ▁garden ▁to ▁the ▁south ▁and ▁west ▁at ▁ground ▁level ▁and ▁by ▁the ▁raised ▁concrete ▁and ▁bit umen ▁station ▁platform ▁on ▁the ▁northern ▁and ▁eastern ▁sides . ▁ ▁Heritage ▁listing ▁ ▁Land s borough ▁Air ▁Ra id ▁Sh elter ▁was ▁listed ▁on ▁the ▁Queensland ▁Heritage ▁Register ▁on ▁ 3 ▁April ▁ 2 0 0 9 ▁having ▁satisfied ▁the ▁following ▁criteria . ▁ ▁The