Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Haɗa tsibirin Honshu da Hokkaido ta hanyar haɗin kai an yi la'akari da shi tun lokacin Taishō (1912<unk>1925), amma binciken da ya dace ya fara ne kawai a cikin 1946, wanda aka haifar da asarar ƙasashen waje a ƙarshen Yaƙin Duniya na II da kuma buƙatar saukar da waɗanda suka dawo. A shekara ta 1954, jiragen ruwa guda biyar, haɗe da Tōya Maru, sun nitse a Tsugaru Strait a lokacin guguwa, suka kashe fasinjoji 1,430. A shekara ta gaba, Kamfanin Jirgin Ruwa na Ƙasar Japan (JNR) ya hanzarta binciken ramin. Wani abin damuwa kuma shi ne karuwar zirga-zirga tsakanin tsibiran biyu. Tattalin arzikin da ke bunƙasa ya ga matakan zirga-zirga a kan jirgin Seikan Ferry da JNR ke sarrafawa ya ninka zuwa fasinjoji 4,040,000 / shekara daga 1955 zuwa 1965, kuma matakan kaya sun ninka sau 1.7 zuwa tan 6,240,000 / shekara. Tsinkayar hasashen zirga-zirgar jiragen ruwa tsakanin tsibirin da aka yi a 1971 ya yi hasashen karuwar ci gaba wanda a ƙarshe zai wuce damar kayan aikin jirgin ruwa, wanda yanayin ƙasa ya ƙuntata.  Tambaya: Menene Tsakanin Tsakanin Tsakanin Tsakanin Tsakanin Tsakanin Tsakanin Tsakanin Tsakanin Tsakanin Tsakanin Tsakanin Tsakanin Tsakanin Tsakanin Tsakanin Tsakanin 1971?
Ƙara girma wanda zai ƙare ya wuce damar da ke cikin tashar jirgin ruwa