uan ian ▁engineer ▁Stanisław ▁K ier bed ź . ▁For ▁construction ▁works ▁has ▁been ▁h ired ▁Ernest ▁Go ü in ▁et ▁C ie . ▁company ▁from ▁Paris . ▁The ▁tunnel ▁was ▁d ug ▁from ▁both ▁sides ▁in ▁a ▁ 3 0 - met re - high ▁hill , ▁under ▁the ▁resident ial ▁area ▁of ▁Š an č iai ▁of ▁Ka unas . ▁The ▁tunnel ' s ▁diameter ▁has ▁the ▁shape ▁of ▁a ▁horses ho e . ▁The ▁upper ▁part ▁was ▁made ▁of ▁br icks ▁( stone work ), the ▁lower ▁part , ▁which ▁is ▁used ▁as ▁a ▁bas ement , ▁is ▁made ▁of ▁gran ite ▁stones . ▁Seven ▁p its ▁were ▁built ▁at ▁the ▁time ▁of ▁construction ▁of ▁tunnel . ▁Through ▁them ▁the ▁steam ▁machines ▁could ▁eliminate ▁the ▁exc av ated ▁soil . ▁Ernest ▁Go ü in ▁et ▁C ie ▁also ▁built ▁two ▁br icky ards ▁in ▁Š an č iai ▁and ▁Pet ra ši ū na i ▁areas , ▁because ▁especially ▁good ▁quality ▁br icks ▁were ▁needed ▁for ▁the ▁tunnel ▁arch es , ▁water ▁passes ▁and ▁other ▁constru ctions . ▁The ▁summer ▁of ▁ 1 8 6 0 ▁was ▁ra iny , ▁therefore ▁lots ▁of ▁produced ▁br icks ▁were ▁found ▁to ▁be ▁defect ive . ▁In ▁order ▁to ▁proceed ▁with ▁the ▁construction , ▁the ▁br icks ▁were ▁being ▁bought ▁and ▁delivered ▁from ▁the ▁Netherlands ▁and ▁Germany . ▁The ▁construction ▁of ▁the ▁tunnel ▁was ▁finished ▁on ▁ 1 5 ▁November ▁ 1 8 6 1 . ▁The ▁explo itation ▁of ▁the ▁railway ▁bridge