A shekara ta 1930, yayin da Yammacin Slovenia ke karkashin ikon Italiya, manyan duwatsu a kan Št.
Tabbas, sigar da ta fi rikitarwa ta jumla ita ce "A cikin 1930, yayin da Yammacin Slovenia ke ƙarƙashin ikon Italiya, an gina duwatsu masu mahimmanci a kan Pivka sosai kuma an haɗa su cikin tsarin tsaron Alpine Wall, wanda ya miƙa daga Bay of Genoa zuwa Kvarner Gulf. "