Remaining are Asari Tunnel (朝里トンネル), which got just finished digging in November so one exit isn't even on Google Maps and Sapporo Tunnel (札幌トンネル) which has the least progress done and I can only find one tunnel entry point and one section entry point
Yoichi Tunnel (余市トンネル), after Kutchan Nitsuki Tunnel (二ツ森トンネル) and Shioya Tunnel (後志トンネル)
After Oshamambe there's Uchiu Tunnel (内浦トンネル), Konbu Tunnel (昆布トンネル), Miyada Tunnel (宮田トンネル) and Niseko Tunnel (ニセコトンネル)
Mapping in progress construction from google maps is fun.
First one was Watari Tunnel (渡島トンネル).
Here's Nifuku Tunnel (二股トンネル), Bifuka Tunnel (碧雲トンネル), Notaguchi Tunnel (野田追トンネル) and after Yakumo Tateishi Tunnel (立岩トンネル).
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