. ▁In ▁the ▁first ▁three ▁months ▁ 8 0 , 0 0 0 ▁people ▁were ▁killed ▁and ▁buried ▁in ▁p its ▁covered ▁with ▁a ▁shall ow ▁layer ▁of ▁earth . ▁The ▁vict ims ▁were ▁Jews ▁deport ed ▁from ▁the ▁Lub lin ▁Gh etto ▁and ▁its ▁vic inity . ▁The ▁original ▁three ▁gas ▁ch amb ers ▁were ▁ins u fficient ▁for ▁comple ting ▁the ▁task ▁at ▁hand . ▁ ▁The ▁second ▁phase ▁of ▁ex termin ation ▁began ▁in ▁July ▁ 1 9 4 2 , ▁when ▁the ▁new ▁gas ▁ch amb ers ▁were ▁built ▁of ▁brick ▁and ▁mort ar ▁on ▁a ▁light weight ▁foundation , ▁thus ▁en abling ▁the ▁facility ▁to ▁" process " ▁Jews ▁of ▁the ▁two ▁largest ▁ag gl omer ations ▁nearby ▁including ▁the ▁Krak ów ▁and ▁the ▁L w ów ▁Gh ett os . ▁The ▁wooden ▁gas ▁ch amb ers ▁were ▁dis m ant led . ▁The ▁new ▁building ▁ 2 4 ▁m ▁long ▁and ▁ 1 0 ▁m ▁wide ▁had ▁six ▁gas ▁ch amb ers , ▁ins ulated ▁with ▁the ▁c ement ▁walls . ▁It ▁could ▁handle ▁over ▁ 1 , 0 0 0 ▁vict ims ▁at ▁a ▁time . ▁The ▁design ▁was ▁soon ▁im itated ▁by ▁the ▁other ▁two ▁Operation ▁Rein hard ▁ex termin ation ▁cam ps : ▁Sob ib or ▁and ▁Tre bl ink a . ▁ ▁There ▁was ▁a ▁hand - p aint ed ▁sign ▁on ▁the ▁new ▁building ▁that ▁read ▁St iftung ▁H ack en hol t ▁or ▁H ack en hol t ▁Foundation ▁named ▁after