Constructing tunnels is an effective technique for criminals to execute horrible crimes such as prison break, bank robbery, drug trafficking, and more. However, few such tunnels become famous due to their method of construction and associated stories of executing the crime.
Here are described five most incredible tunnels that were constructed for horrible crimes.
A bank robbery by digging 262 ft tunnel
A burglary had executed at the local Central Bank in the Brazilian city of Fortaleza .It was not just the amount of cash taken that was surprising, but the style in which the offense had been executed. To burgle the bank, the thieves excavated an 80-metre tunnel, wood adorned and integrated with electric lights and basic air-conditioning; their last engineering deed had been to drill through a steel-reinforced concrete.
The tunnel's doorway was a block away from the bank in a shop that professed to house a company selling artificial grass, but this was actually a frontage used by the thieves to cover up their true intention. They were systematic in crafting the illusion, issuing free baseball caps and even advertising.
The vault that time had been full of cash, brand new currency, all set to be released into circulation, and old currency that had been withdrawn possibly to be cremated. The gang captured only the used currency - the bank had kept no trace of their serial numbers. They were undetectable. In all, 40m was taken. 
A tunnel for drug trafficking across the US-Mexico Border
In 1991, U.S. Drug Enforcement Agency (DEA) officials had found a delicately engineered tunnel of 270 feet beneath the U.S.-Mexico border, supposed to be the work of Mexico's Sinaloa Cartel, the most dominant drug-trafficking group in the world.
Designed with covert hatches and cavernous rooms, smugglers could effortlessly shift tons of drugs from Mexico to the U.S without being noticed. Hydraulic lifts in a lawyer's home were used to elevate the floor under a pool table, exposing a shaft that led to the passageway. The tunnel was complete with lighting and was even air-conditioned.
135 ft Tunnel for bank robbery in Berlin
In 1995, a bank robbery was executed in Berlin through digging an incredible tunnel. The robbery was rather similar to the ‘Gold Digger Robbery’; however, the thieves were more professional in this case.
Smart thieves rented a garage that happened to be suitably situated next to the Berliner Volksbank. Working bit by bit for a number of months, they were able to construct a passageway that was 135 ft. long, complete with lights, ventilation, and metal supports. At the tunnel's end, they had to tunnel through the 3-foot thick walls of the underground safe deposit room.
The robbers Escaped with money and valuables in deposit boxes setting fire to the tunnel to cover up their tracks. Several but not every one of the thieves were later arrested.
A tunnel from North Korea to invade South Korea
Only 27 miles from Seoul, the 'third tunnel of aggression' was exposed in 1978 based on information provided by a renegade. This tunnel was 1.1 miles long and 6.6 ft. high and wide, permitting one complete military division to move per hour.
The tunnel was constructed by North Korea, allegedly to invade the South. At first, The North denied the allegation, but when two of them were exposed in the 1970s, the North Korean replied they were only for mining coal. However, when a third one was discovered in 1978 that was very close to Seoul, the delicate truce was almost suspended.
A fourth was also found in the 1990s, and there are supposed to be 20 more. But in some way, even if the two rivals are always on the edge of war, the Third Tunnel is a popular tourist spot in South Korea.
A 360ft tunnel across US-Canada Border for drug trafficking
While concentrating only on smuggling contraband from Mexico to the U.S., a new route had been exposed by US officials coming from America's friendly nation Canada. The 360-feet tunnel, which opened in the living room of a deserted house on the US side, is the first to be revealed along the US-Canada border. It was only used temporarily to smuggle marijuana, and other illegal goods.
The tunnel, which was integrated with electricity and ventilation, is supposed to have taken about a year to build. It was constructed with wood and reinforced with metal and concrete. A small cart had also been fitted to shift goods and people.
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