Untitled attachment https://media.gameliberty.club/media/media_attachments/files/113/782/689/522/356/075/original/6567f0a04d1279d4.png
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 Tateishi Tunnel (立岩トンネル).