80,000-tonne concrete blocks at a Shenzhen shipyard before being sunk to the sea floor

From above, massive reinforced concrete structures are visible in the dock of a CSSC shipyard in Shenzhen. Towering red gantry cranes used to lift and position the 80,000-tonne blocks stand nearby. This is where the elements destined for submersion on the seabed of the future underwater project are being prepared.