ミズーリのスプリングフィールドの洞窟みたいな地下倉庫を走る動画が><
What's in the Caves in Springfield, Missouri? BigRigTravels takes you underground 4/27/21 Train!! - YouTube https://www.youtube.com/watch?v=E6X9fKdTvxo
地下倉庫の解説の動画見つけた><
Digging Deep: See how Springfield Underground works with BNSF to serve customers - YouTube https://www.youtube.com/watch?v=VhFzzrbp-4E