Another great front view video on JR East's own railfan channel TRAInBLAZER. At about 34:40, the train is entering a tunnel called 鼠噛. I can't find any references to this online, and I'm not sure how it's read, but it means mouse/rat bite. The following station is Nezugaseki, in which 'nezu' is the character for mouse/rat. Far out.