Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
tunnel [ˈtʌnl] n (passage) тунне́ль m (in mine) што́льня
vi прокла́дывать (проложи́ть*perf) тунне́ль
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: