"The bridges stop at the interchange, and vehicles will enter the 46-meter-wide immersed tunnel, the widest in the world, arriving in Shenzhen on the east," Chen said, adding the design should provide enough space for ships passing through the river.

Also, as a step to advance infrastructure development in the GBA, the 24-kilometer-long mega project connects Guangdong's three pilot free trade zones of Qianhai in Shenzhen, Nansha in Guangzhou and Hengqin in Zhuhai.

The project, which costs more than 44.69 billion yuan ($6.38 billion), is not only improving transportation in the GBA, but also providing an alternative option for those who cannot bear ever-rising house prices in Shenzhen.

Ricky Woo, a Hong Kong native currently working in the city as an insurance broker, believes owning a house is a distant dream for him.

"I am renting a house an hour's drive from my office in the city's downtown, and payment is quite expensive," the 26-year-old said.

But on the other side of the Link, housing prices in Zhongshan are only one-fifth of Shenzhen's, which, according to Ricky, may help him accomplish his dream of having a house of his own.

"I told my friends unless something unexpected happens, I do not think that I am able to buy a house at my age, but I will keep my eyes on the project," he said. "It may change my life in the near future."