Wikipedia:Articles for deletion/Tunnel problem
Appears to be notable, concept discussed in books https://books.google.com/books?id=m28sDwAAQBAJ&pg=PA603https://books.google.com/books?id=N3QzDwAAQBAJ&pg=PT35 and other articles already mentioned. Should satisfy 
— User:Hzh, 13:34, 23 July 2018 (UTC)
Stance: keep
Cited policy: WP:GNG (Wikipedia:Notability)