...The tunnels are a perfect labyrinth... 
Various 「Astounding Stories, August, 1931」
...So mountainous is the land that it would have to be one series of tunnels...
William Wells Brown 「Clotelle」
...What a pity they cannot hire moles tomake the tunnels with their strong, flat, spade-like feet...
Neltje Blanchan 「Birds Every Child Should Know」
...Nesting chambers are excavated in sandy-clay banks, piles of sand,piles of sawdust, or similar sites, at ends of tunnels one to morethan three feet in depth from the vertical face of the substrate...
Richard F. Johnston 「The Breeding Birds of Kansas」
...She has, in addition, to polish and glaze the rough sides of her tunnels...
J. Henri Fabre 「Bramble-bees and Others」
...Around the housestudied there was an incomplete moat connected with a channelleading to deep water, and canals and tunnels radiated outthrough the bog...
L. R. Dice 「Notes on the Mammals of Gogebic and Ontonagon Counties, Michigan, 1920」
...Within this lowergallery is a chamber, which communicates with the upper gallery by threedescending tunnels...
R. Lee 「Anecdotes of the Habits and Instinct of Animals」
...When a mole enters the house fromone of the tunnels, he must go through the basement in order to get tothe upper part of the house and so descend into the keep...
Royal Dixon 「The Human Side of Animals」
...” This grub, he says, is white,about an inch long, and tunnels the fleshy leaves of the agave...
Alfred M. Tozzer and Glover M. Allen 「Animal Figures in the Maya Codices」
...For several feet in everydirection around here the ashes were traversed by the tunnels and densof these animals, some of them extending down into the clay...
Gerard Fowke 「Archeological Investigations」
...He glimpsed wormmonsters here and there emerging from the upward tunnels with massesof strange plant stuff in their grasp that others blindly devoured...
Various 「Astounding Stories, April, 1931」
... there came a red flash from one of theupward tunnels and a brilliant crimson ray stabbed down and mowed apath of annihilation in the cave's earthen side!...
Various 「Astounding Stories, April, 1931」
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