It was on this date in 1927 that vehicular traffic first began going underground in the U.S. Cars and trucks traveled between New Jersey and New York and back again on a 20-foot wide, twin-tube tunnel that reached a depth of more than 90 feet below the waters of the Hudson River. Today we commemorate the opening of the Holland Tunnel—which was named for its engineer, Clifford M. Holland—by burrowing through the dictionary for other tunnel terms.

Some tunnels occur in water, such as the tunnel that names "the hollow arch of water formed when the crest of a breaking wave spills forward." Other tunnels can be placed into water. That's the story behind the tunnel net, the long bag net or conical net that is kept open by a series of hoops and is used to catch fish.

The human body is home to a tunnel, too: the tunnel of Corti honors the Italian anatomist who discovered the mechanism by which sound waves are converted into neural impulses. And of course, human bodies enjoy tunnels of love, dark tunnels conveying passengers by boat in amusement parks.

We close with a close look at tunnel vision. Opthalmologists know about this constriction of the visual field that results in a loss of peripheral vision among some hysterics. But you don't need special optical tools to diagnose tunnel vision in its broader sense, referring to any narrow-mindedness.

I thought of one! Wind tunnel.
I could write it all down, I suppose...but go HERE:
http://www.hq.nasa.gov/office/pao/History/SP-440/ch1-1.htm

Oh, and who can forget "Tunnel of Love"...
http://www.funnyfair.com/tunnel.htm
It was a fair ride AND a movie with Doris Day and somebody!

And the dramatic black and white footage of the "tunnels" beneath the Berlin Wall....
http://www.rochester.k12.mn.us/kellogg/rodgers/europe/wallgraphic.htm