wię c im ▁– ▁Br ze z ink a , ▁ed . ▁by ▁Francis zek ▁Pi per . ▁ ▁Following ▁Operation ▁Bar bar ossa , ▁all ▁of ▁them ▁under w ent ▁special ▁training ▁at ▁the ▁Tra wn iki ▁SS ▁camp ▁division ▁before ▁they ▁were ▁posted ▁as ▁" H iw is " ▁( G erman ▁letter word ▁for ▁Hil f sw ill igen , ▁lit . ▁" th ose ▁willing ▁to ▁help ") ▁in ▁the ▁concentration ▁cam ps ▁as ▁gu ards ▁and ▁gas ▁chamber ▁operators . ▁They ▁provided ▁the ▁bulk ▁of ▁W ach m änner ▁collabor ators ▁in ▁all ▁major ▁killing ▁sites ▁of ▁the ▁" Final ▁Solution ". ▁ ▁Gas ▁ch amb ers ▁ ▁The ▁more ▁detailed ▁description ▁of ▁how ▁the ▁gas ▁ch amb ers ▁at ▁Be ł ż ec ▁were ▁managed ▁came ▁in ▁ 1 9 4 5 ▁from ▁Kurt ▁Ger stein , ▁Head ▁of ▁the ▁Techn ical ▁Dis in fection ▁Services ▁who ▁used ▁to ▁deliver ▁Z y kl on ▁B ▁to ▁Aus ch witz ▁from ▁the ▁company ▁called ▁D eg esch ▁during ▁the ▁Hol oca ust . ▁In ▁his ▁post war ▁report ▁written ▁at ▁the ▁R ott we il ▁hotel ▁while ▁in ▁the ▁French ▁cust ody , ▁Ger stein ▁described ▁his ▁visit ▁to ▁Be ł ż ec ▁on ▁ 1 9 ▁or ▁ 1 8 ▁August ▁ 1 9 4 2 . ▁He ▁witness ed ▁there ▁the ▁un loading ▁of ▁ 4 5 ▁cattle ▁cars ▁crow ded ▁with ▁ 6 , 7 0 0 ▁Jews ▁deport ed ▁from ▁the ▁L w ów