The Tunnel is an underground passage (usually), built in an effort to address the growing need for roads, highways and bridges to handle large volumes of traffic. The exact definition of the tunnel has been stiffened many times in the past. Apart from that, the tunnel is the result achieved by a remarkable achievement of engineering, with a boring giant hole in the mountains, or put a few meters below the sea lane. Let's look at the strange tunnel in the world.
Channel Tunnel: Located in Coquelles, France, the tunnel is commonly known as the Channel. This tunnel has panjag 31 kilometers that connects England and France was built in 1994 with a staggering cost of more than $ 20 billion. The idea of linking England and France via the English Channel worked for several years. However, the project can not be formed due to various reasons, technical and political included. The invention of modern machinery coupled with the undeniable benefits by linking the two countries finally possible. In order to provide protection from fire hazards, designers have built a smaller service tunnel in between the main tube for extra escape Teo.
Smuggling tunnels are located in Tijuana, Mexico, has a length of 1000 meters. Long tunnel was discovered by U.S. and Mexican officials. The tunnel is used by criminals scheming to smuggle drugs and never be heard in the past. Over the past few years, a large number of illegal tunnels have been discovered in the U.S., comes from Canada and Mexico. This tunnel has a length of 860 meters to the United States. The tunnel is fully equipped with lighting, ventilation systems, electricity and even elevators. The U.S. Drug Enforcement Agency issued a statement saying that the tunnel construction has been going on for over two years.
Infiltration Tunnel
Infiltration Tunnel: In the 1970s, three different tunnels found along one border of the two countries most at odds over the world. In 1990, a fourth tunnel was found slithering beneath the Korean demilitarized zone. The third invasion tunnel, also known as Aggression Third Tunnel, almost only 26 miles from Seoul, South Korea's capital. Secret tunnel gives North Korea the military launched a major advantage of the massive South Korean his powerful enemies. The tunnel is large enough to shuttle entire military divisions per hour.
Tunnel Chu Ci
Ci Chu Tunnels located in Cu Chi, Vietnam, this giant maze of tunnels played a vital role during the French Indochina War and the Vietnam War. This tunnel size ranges from 75 miles to more than 150 miles. Cu Chi Tunnels has become a popular tourist destination in recent years, allowed visitors to travel through a narrow space, check your trap shut and even traveled to the underground command center from which the Tet attacks are planned.
Tokyo Bay Aqua-line 
Tokyo Bay Aqua-line: the tunnel is located in the city of Kawasaki, Japan. This tunnel has a length of 6 miles by 3 miles long bridge dipped into it. Traffic allowed to travel in 1997, allowing travelers between the cities of Kawasaki and Kisarazu City to travel about 45 minutes every day. The unique thing about the combination bridge-and-tunnel is a major resting place is located on top of an artificial tunnel built at the entrance of this tunnel. The island is called Umi-Hotaru, which means "sea firefly", and serves as a resting place which consists of shops and restaurants, along with the observation deck that looks out into the bay.
