" ▁( Per ▁= ▁Pet rus , ▁meaning ▁rock ▁in ▁Greek , ▁and ▁Berg ▁meaning ▁mountain ▁or ▁rock ▁in ▁Norwegian ), ▁in ▁order ▁to ▁protect ▁his ▁family ▁in ▁Norway ▁from ▁German ▁repr is als . ▁ ▁In ▁what ▁later ▁became ▁known ▁as ▁the ▁" Gre at ▁Es cape ", ▁he ▁was ▁escape e ▁# 4 3 ▁among ▁the ▁ 7 6 ▁prisoners ▁of ▁war ▁who ▁managed ▁to ▁escape ▁from ▁the ▁camp ▁via ▁tunnel ▁with ▁another ▁Norwegian ▁pilot , ▁escape e ▁# 4 4 ▁J ens ▁Müller , ▁ ▁Ber gs land ▁and ▁Müller ▁made ▁it ▁to ▁the ▁nearby ▁town ▁of ▁S agan , ▁where ▁they ▁caught ▁a ▁train ▁to ▁St ett in ▁in ▁Germany ▁( now : ▁Sz cz ec in , ▁Poland ). ▁At ▁the ▁port , ▁the ▁pair ▁were ▁sn uck ▁onto ▁a ▁neutral ▁Swedish ▁ship ▁by ▁friendly ▁sail ors ▁and ▁made ▁it ▁to ▁the ▁safety ▁of ▁Goth enburg . ▁There , ▁they ▁entered ▁the ▁British ▁cons ulate , ▁who ▁arranged ▁travel ▁by ▁train ▁to ▁Stockholm , ▁where ▁they ▁were ▁flow n ▁to ▁Scotland ▁from ▁the ▁B rom ma ▁air port . ▁From ▁there ▁they ▁were ▁sent ▁by ▁train ▁to ▁London ▁and ▁shortly ▁afterwards ▁to ▁' L ittle ▁Norway ' ▁in ▁Canada . ▁ ▁In ▁total , ▁only ▁three ▁P OW s ▁from ▁St al ag ▁Luft ▁III ▁made ▁it ▁to ▁neutral ▁countries ▁and ▁freedom . ▁▁ ▁The ▁third ▁escape e ▁was ▁the ▁Dutch man ▁Br am ▁van ▁der ▁Sto k , ▁who ▁crossed ▁most ▁of ▁occupied ▁Europe ▁and ▁escaped ▁to