• Showing the mouth of one of the tunnels
    Showing the mouth of one of the tunnels
  • WordNet 3.6
    • v tunnel force a way through
    • v tunnel move through by or as by digging "burrow through the forest"
    • n tunnel a passageway through or under something, usually underground (especially one for trains or cars) "the tunnel reduced congestion at that intersection"
    • n tunnel a hole made by an animal, usually for shelter
    • ***

Additional illustrations & photos:

The Channel Tunnel The Channel Tunnel
Electric locomotive in tunnel Electric locomotive in tunnel
Part of the tunnel Part of the tunnel

Webster's Revised Unabridged Dictionary
  • Interesting fact: At 120 miles per hour, a Formula One car generates so much downforce that it can drive upside down on the roof of a tunnel
    • Tunnel (Mining) A level passage driven across the measures, or at right angles to veins which it is desired to reach; -- distinguished from the drift, or gangway, which is led along the vein when reached by the tunnel.
    • Tunnel A vessel with a broad mouth at one end, and a pipe or tube at the other, for conveying liquor, fluids, etc., into casks, bottles, or other vessels; a funnel.
    • Tunnel An artificial passage or archway for conducting canals, roads, or railroads under elevated ground, for the formation of roads under rivers or canals, and the construction of sewers, drains, and the like.
    • Tunnel The opening of a chimney for the passage of smoke; a flue; a funnel. "And one great chimney, whose long tunnel thence
      The smoke forth threw."
    • Tunnel To catch in a tunnel net.
    • Tunnel To form into a tunnel, or funnel, or to form like a tunnel; as, to tunnel fibrous plants into nests.
    • Tunnel To make an opening, or a passageway, through or under; as, to tunnel a mountain; to tunnel a river.
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: Boeing completed more than 15,000 hours of wind-tunnel testing on the first 747
    • n tunnel The opening of a chimney for the passage of smoke; a flue.
    • n tunnel Hence, figuratively, a nostril.
    • n tunnel A funnel. See funnel, 1.
    • n tunnel A long pipe-like passage made of wire, into which partridges were decoyed.
    • n tunnel A tunnel-net.
    • n tunnel An arched drain.
    • n tunnel A gallery, passage, or roadway beneath the ground, under the bed of a stream, or through a hill or mountain. Tunnels are used in military operations, in mining, in conveying water, and as passageways for vehicles and railway-trains. They are of various construction, according to the character of the soil or rock through which they pass. In soft silt or sand, as in subways beneath a stream, the interior of the tunnel is lined with brickwork, with, in some instances, a shield of plateiron outside the bricks. In soil, soft rock, or qnicksands, heavy masonry lining is sometimes required. In solid rock, a simple excavation is generally sufficient, as in many of the shorter railroad-tunnels. The section of a tunnel is usually a cylindrical or elliptical arch, with sometimes, in soft soils, an inverted arch below. The earlier modern tunnels were excavated by hand-drilling and blasting; but machine-drilling, by means of compressed air, has been brought to great perfection, and the rate of progression has been increased and the cost of excavation reduced. In the Greathead system of tunneling, the tunnel is made by the use of a cylindrical shield driven forward by hydraulic pressure; the excavation is lined with a east-iron shell, and the interspace between the shell and the sides of the excavation is lined with grout forced in by air-pressure. The shell is made of segments bolted together. Silt and mud are forced through doors in the face of the shield, and excavated material is taken out through air-locks in the bulkhead of the tunnel. The longest railroad-tunnel is the St. Gotthard, through the Alps (about 9 miles); the longest in the United States is the Hoosac tunnel, in western Massachusetts (4¾ miles).
    • n tunnel In mining, any level or drift in a mine open at one end, or which may serve for an adit. See adit, 1.
    • n tunnel In zoology, the underground burrow of some animals, when long and tortuous, as of the mole or of the gopher.
    • tunnel To form, cut, ordig a tunnel through or under.
    • tunnel To form like a tunnel; hollow out in length.
    • tunnel To catch in a tunnel-net.
    • tunnel To form, cut. or drive a tunnel.
    • ***
Chambers's Twentieth Century Dictionary
  • Interesting fact: A mole can dig a tunnel three hundred feet long in a single night
    • n Tunnel tun′el an arched passage cut through a hill or under a river, &c.: the long underground burrow of certain animals, as the mole: any mine-level open at one end:
    • v.t Tunnel to make a passage through: to hollow out:—pr.p. tunn′elling; pa.t. and pa.p. tunn′elled
    • n Tunnel tun′el (Spens.) a flue, chimney
    • ***


  • Graham Greene
    “Unhappiness in a child accumulates because he sees no end to the dark tunnel. The thirteen weeks of a term might just as well be thirteen years.”
  • Source Unknown
    Source Unknown
    “Don't be too optimistic. The light at the end of the tunnel may be another train.”
  • Robert Lowell
    Robert Lowell
    “If we see light at the end of the tunnel, it the light of the oncoming train.”
  • John Quinton
    John Quinton
    “Politicians are people who, when they see light at the end of the tunnel, go out and buy some more tunnel.”


Webster's Revised Unabridged Dictionary
F. tonnelle, a semicircular, wagon-headed vault, a tunnel net, an arbor, OF. also tonnel,; dim. of tonne, a tun; -- so named from its resemblance to a tun in shape. See Ton
Chambers's Twentieth Century Dictionary
O. Fr. tonnel (Fr. tonneau), a cask; also O. Fr. tonnelle, an arched vault, dim. of tonne, a cask.


In literature:

The water from their tunnel floods into Zyobor.
"Astounding Stories of Super-Science September 1930" by Various
At the same time the Germans were tunneling to plant mines under the Bedfords' trench.
"The Story of the Great War, Volume III (of VIII)" by Various
Down a sloping tunnel they followed her for half a mile.
"The Solar Magnet" by Sterner St. Paul Meek
One day his hat was found in the tunnel, and no sign of Durkin from that day to this.
"The Spoilers of the Valley" by Robert Watson
They slowed and dipped toward one block-like building not far from the water-tunnel's opening.
"Astounding Stories of Super-Science, August 1930" by Various
It went slantingly down into the ground, a great tunnel, deep in the rock.
"Astounding Stories of Super-Science, June, 1930" by Various
The tunnel dipped down at a slight angle, then straightened off horizontally.
"Two Thousand Miles Below" by Charles Willard Diffin
Rutherford paused for a moment, then started in the direction of the tunnels.
"The Award of Justice" by A. Maynard Barbour
The tunnel-mouth which had caused Alan's apprehension was about a hundred feet away.
"Astounding Stories, March, 1931" by Various
A sloping tunnel led to the interior, and the Captain going in front, we entered.
"How I Filmed the War" by Lieut. Geoffrey H. Malins
A tunnel does lead both to and from the place where you stand.
"Astounding Stories, May, 1931" by Various
At any rate, the place we want to go is the end of that tunnel.
"Astounding Stories of Super-Science, December 1930" by Various
We didn't know what he was up to; we weren't even sure he was actually down in those tunnels.
"Anything You Can Do" by Gordon Randall Garrett
Let me tell you, that tunnel was not prepared in a day or two, or even in a week, I am certain.
"With Joffre at Verdun" by F. S. Brereton
But they had their lamps, and did not mind the tunnel; it was familiar enough to them, who had worked in it for months.
"Fairy Tales from the German Forests" by Margaret Arndt
These people have tunneled beneath the meteor.
"Astounding Stories, July, 1931" by Various
Some of the freight cars were also run into the tunnel and set on fire when the wood work was kindled.
"History of Morgan's Cavalry" by Basil W. Duke
She ran, almost flying down the cave-tunnel with great leaps that covered many yards each.
"The Giants From Outer Space" by Geoff St. Reynard
A square box some twenty feet down the tunnel.
"The Legion of Lazarus" by Edmond Hamilton
If the walls of the narrow tunnel pressed him too straitly, he could expand them by a few seconds of digging.
"The Haunters of the Silences" by Charles G. D. Roberts

In poetry:

But when he ceased
And silence was--
Who could but fear what evil sprite
Crept through the tunnels of the night?
"The Enemies" by John Freeman
Here in this tunnel
He was my pardner,
That same Tom Flynn,--
Working together,
In wind and weather,
Day out and in.
"In The Tunnel" by Francis Bret Harte
We charge the tunnels headlong -
The blackness roars and shatters.
We crash between embankments -
The open spins and scatters.
"We Flash Across The Level" by William Ernest Henley
Mr. Ramsay MacDonald
Wished the Channel could be tunnelled.
He said it always got his goat
To be asked if he lunched on the boat.
"Clerihew – Ramsay MacDonald" by Edmund Clerihew Bentley
Or where half-way the mountain side was furrowed
With many a seam and scar;
Or some abandoned tunnel dimly burrowed,--
A mole-hill seen so far.
"The Hawk's Nest" by Francis Bret Harte
Beneath the trees, on sandy pathways,
Not one bright spot relieves the dark,
Save-like an opening in a tunnel-
The distant entrance of the park.
"The Linden Avenue" by Boris Pasternak

In news:

And New York's Water Tunnel No.
S now is falling outside the Holland Tunnel.
Seeing double in a poetic memory tunnel.
Nassau County's emergency command center for dealing with disasters is hidden amid a maze of hallways and tunnels some 25 feet beneath Police Headquarters here.
I warned them about those Great Allegheny Passage tunnels.
Commissioners for the Port of South Whidbey can see a light at the end of the long bureaucratic tunnel toward completion of the boat launch at Bush Point.
"' Neighborhood #1 (Tunnels)' is such a song.".
Another border drug tunnel found.
View from inside a tunnel recently found in the northern border city of Tijuana, Mexico Wednesday Nov 30, 2011.
New Jersey commuters who headed back to New York City to work on Monday found a chaotic landscape of long lines, jammed buses and rail cars and lengthy waits to get through tunnels due to the impact of superstorm Sandy.
Nogales 's Drug Tunnels.
Tunnel Capital of the Southwest.
The light at the end of the tunnel is a train.
Outbound Squirrel Hill Tunnel will be single lane tonight.
Mr Horton died in a tunnel fire on Feb 5, 2012.

In science:

The probability of tunneling between coherent clusters increases also correspondingly.
Hierarchic Models of Turbulence, Superfluidity and Superconductivity
Because the tunneling gap is so small, thermal environments have strong influence on the tunneling, which has been studied extensively.
Nonexponential Relaxation of Magnetization at the Resonant Tunneling Point under a Fluctuating Random Noise
The solid line is for electron tunneling into the superconductor and the dashed line is for electron tunneling out of the superconductor.
Electromagnetic response of high-Tc superconductors -- the slave-boson and doped-carrier theories
The effect of supercurrent on the tunneling dI /dV curve can also be studied by tunneling near a vortex.
Electromagnetic response of high-Tc superconductors -- the slave-boson and doped-carrier theories
The difference is caused by the exponential dependence of the tunneling rate on the mass of a tunneling particle.
Theory of ultracold Fermi gases
Fermis Golden Rule then predicts, G(T ) ∼ T αbulk for tunneling into the bulk of a LL while tunneling into the end leads to G(T ) ∼ T αend .
Coupling-geometry-induced temperature scales in the conductance of Luttinger liquid wires
We have given a derivation of Unruh radiation in terms of the original heuristic explanation as tunneling of virtual particles tunneling through the horizon1 .
A WKB-like approach to Unruh Radiation
Schwarzschild spacetime in Painlev´e– Gulstrand coordinates) where the tunneling rate depends on the direction in which barrier is traversed so that (9) over (10) are not equivalent and will thus yield different tunneling rates, Γ.
A WKB-like approach to Unruh Radiation
For local tunneling spectroscopy, a sweep of bias voltage V was applied between the silicon sample and a metallic tip at a fixed sample-tip distance, while the induced tunnel current I was recorded.
Subkelvin tunneling spectroscopy showing Bardeen-Cooper-Schrieffer superconductivity in heavily boron-doped silicon epilayers
The quality of the tunnel junction has been controlled by recording the differential conductance dI /dV at different tunneling resistances, i.e. different sample-tip distances.
Subkelvin tunneling spectroscopy showing Bardeen-Cooper-Schrieffer superconductivity in heavily boron-doped silicon epilayers
To avoid the slow superexchange process, new experiments exploiting the direct tunneling of particles, which are controlled by J instead of 4J 2/U , have been developed for observing controlled tunneling and simulating antiferromagnetism .
Coherent Directed Transport of Neutral Atoms in Unmodulated Optical Lattices
It is much larger and longer than the tunnel used by Hurst & Vassilicos (2007) and the grids were placed in the tunnel contraction, specifically 1.2m upstream from the start of their test section.
Dependence of decaying homogeneous isotropic turbulence on initial conditions
The tunneling problem was so lved in quasi-hydrodynamic representation in Paragraph 7, when alpha-decay of nuclei was studied. Tunneling was looked at from a potential well with finite motion o f part icles with a zero translation mot ion component.
Quantum Physics and Nanotechnology
Within a simplified model of the tunneling process the differential tunneling conductance dI /dV (r, V ) at a location r and Voltage V is proportional to the single-particle density of states at energy ω .
Probing the Unconventional Superconducting State of LiFeAs by Quasiparticle Interference
Moreover, the three coupling processes described above give rise to interesting dynamical phenomena, like vortex tunneling and vortex/antivortex creation/annihilation along with the tunneling of atoms with non-zero m.
Macroscopic superposition states of ultracold bosons in a double-well potential