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Longest tunnel of the Central Yunnan Water Diversion Project [93] Railway Twin Tube Mont d'Ambin Base Tunnel: Cottian Alps, France/Italy 57,500 m (35.729 mi) 2032 [94] Part of the Lyon–Turin high-speed railway. Reconnaissance tunnels under construction since 2002; construction of main tunnel started in 2016. [95] Railway Twin Tube Brenner ...
The system of Odessa Catacombs consists of a network of basements, bunkers, drainage tunnels and storm drains as well as natural caves. [1] The catacombs are on three levels and reach a depth of 60 metres (200 ft) below sea level. It is one of the world's largest urban labyrinths, running up to 2,500 kilometres (1,600 mi). [1]
Baiyunshan Tunnel China 6.458 km (4.013 mi) 2026 2 Yuxiang 2nd Expressway Wufu Tunnel China 6.454 km (4.010 mi) 2026 2 G50 12 Enshi-Guangyuan Expressway Baolongping Tunnel China (Chongqing, Sichuan) 6.450 km (4.008 mi) 2025 2 Chongqing-Chishui-Xuyong Expressway Jiangyin-Jingjiang Yangtse River Tunnel
(Phases 4 and 5, Gardens by the Bay – Sungei Bedok are 13 km in length and are currently under construction, all underground) 43.4 km (27.0 mi) Phase 4：2024 Phase 5：2025 Line 11: Guangzhou Metro China: Circle route, all underground 43.2 km (26.8 mi) 2024 Troitskaya line: Moscow Metro Russia: Whole line is underground 40.2 km (25.0 mi)
Melbourne is said to have the largest underground tunnel system in the world spanning over 1,500 km (930 mi), with the clandestine group known as the Cave Clan who meet regularly to explore, vandalise, socialise and map out this network. The vast majority of these tunnels are decommissioned or for stormwater purposes.
Artemisio Tunnel (road), double tunnel, under Mount Artemision, 1.40 km 76 tunnels of the A2 motorway (Egnatia Odos), most notably in parts of Epirus and Western Macedonia , combined length of 99 km, the longest of which are Driskos Tunnel 4.6 km, Metsovo Tunnel 3.5 km, Dodoni Tunnel 3.6 km, Kastania Tunnel 2.2 km, Anilio Tunnel 2.1 km
The tunnel system is a far cry from the ... Musk had envisioned sci-fi systems for cities worldwide that would shoot pods carrying passengers through underground tubes at hundreds of miles per ...
Poola Subbaiah Veligonda Project Tunnel - II [70] [65] Andhra Pradesh, India: 18.83 km (11.7 mi) 2021 [needs update] Irrigation Poola Subbaiah Veligonda Project Tunnel - I [70] [65] Andhra Pradesh, India: 18.82 km (11.7 mi) 2020 [needs update] [71] Irrigation Many more tunnels that are shorter than 15 kilometres (9 mi) are under construction