Answer:

tunnels

Answer	Crossword Clue
TUNNELS	Goes underground
TUNNELS	Some escape routes
TUNNELS	Underground routes

TUNNELS	Certain escape routes
TUNNELS	Roads under rivers
TUNNELS	Mole creations
TUNNELS	Excavates, in a way
TUNNELS	Subways.
TUNNELS	Something burrowed
TUNNELS	Secret passages, maybe
TUNNELS	Secret ways

TUNNELS	Moles' production
TUNNELS	Places for moles
TUNNELS	Ant farm features
TUNNELS	Travels mole-style

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.