Busan, one of the busiest cities around the world was running out of room. The only solution was Geoje, a city only 8 kms away by sea but 140km away by road. How did the Koreans solve this problem? By building a highway immersed into the sea connecting both the cities.

Deepest Sea Highway tells the story of these two cities only 8 kilometres away by sea connected. One is over flowing with population while on the other one it’s hard to find a person.

It is a four-lane highway that runs almost fifteen meters beneath the sea then leaps along two colossal cable state bridges. This was one of the biggest infrastructure projects around the world. The tunnel is composed of 18 mammoth segments each as long as two football pitches and wide enough to carry two lanes of traffic each way. Each segment was first carefully towed into the right position then aligned within 35 mm of each other.

Measures had to be taken to ensure the safety of the fixed link. Thus concrete columns were borne into the sea bed to avoid earth quakes and provide a stable ground to the highway. Later, the entire tunnel was covered with thousands of tons of crushed rock to avoid collision with ships or tankers. On the other hand, the construction of the pile on bridges was also at its peak.

The bridges were huge, and the curved design was very challenging to construct. Nonetheless, the teams tirelessly kept working on the design and finally managed to complete one of the world’s toughest structures ever.

How they did it and what challenges they had to face? Watch all this and much more in Deepest Sea Highway