6 books
Right now there are 4 known books, Tunnels, Deeper, Freefall, and Closer.
There are currently 4. More could come out.
There is 15 tunnels
Tunnels of Blood has 172 pages.
Tunnels - novel - has 464 pages.
There are many books, but my favorites were a living nightmare, the vampire's assistant and tunnels of blood! I think you would like them all!
There are 92 tunnels in konkan railway.
Spiral - Tunnels novel - has 429 pages.
No. Mouseheart is set in modern Brooklyn in the subway tunnels. Mice, rats, squirrels, and even cats live within. Many books for children include anthropomorphized animals and that is all these two books have in common.
Many of New York City's homeless live in the abandoned subway tunnels, especially during the winter months.
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