Hausafulaniblog on Instagram: "China has just completed the Shenzhen–Zhongshan Link — a massive 28 km cross-sea corridor across the Pearl River Estuary 🌉🌊 The project combines long-span bridges, artificial islands, and a 6.8 km underwater immersed tunnel — one of the widest in the world with eight lanes of traffic. What once took nearly 2 hours now takes just 20–30 minutes! Engineers used prefabricated tunnel sections lowered precisely onto the seabed and sealed together, with advanced ventila