The positioning of the sea wall is scientifically sound, reasonable and safe. There’s no indication blocks are drifting away. – Daniel Chung, Director of Highways Department
The aerial photographs posted on the internet, showed that a number of interlocking concrete blocks, known as dolosse, at the edge of the eastern artificial island appeared to have become displaced. The blocks are meant to absorb the impact of strong waves and protect the island and tunnel. In one set of images taken at low tide, the dolosse are scattered above water. At high tide, they are submerged.
The images sparked an outcry.
Representatives of the Hong Kong-Zhuhai-Macau Bridge Authority, including officials from the three governments, argue that the dolosse are actually designed specifically to be submerged in a “random manner”.
Those stacked at the side of the island that rise above the water surface are there to absorb the force of the waves. Others are there to prevent vessels from sailing too close and damaging the undersea tunnel.
The Pulse Podcast (13-4-2018): Hong Kong-Zhuhai-Macao Bridge’s Artificial Island Controversy: Discussion with Albert Lai & Raymond Chan