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A polytunnel (also known as a polyhouse, hoop greenhouse or hoophouse, grow tunnel or high tunnel) is a tunnel typically made from steel and covered in polyethylene, usually semi-circular, square or elongated in shape.
Kilpatrick (Innishannon) (Cork to Bandon - 122 meters) Lisummon (Newry to Armagh - 1,608 meters) Loughgilly (Newry to Armagh - 334 meters) Mount Elliot (Macmine Junction to New Ross - 684 metres) Newport No. 1 (Westport to Achill - 81 metres) Newport No. 2 (Westport to Achill - 122 metres) Prospect Hill, Galway (Galway to Clifden - 81 metres)
10 km (6.2 mi) 2009/2011 1* A86 *the two two-lane directions are superimposed (hence duplex) in one tube Lowari Tunnel: Pakistan 8.5 km (5.3 mi) 1975 2017 1 N-45 / Dir-Chitral Highway: Part of a group of two consecutive tunnels: 8.5 km (5.3 mi) and 1.9 km (1.2 mi) Many more tunnels exist that are shorter than 10 kilometres (6 mi)
2.4 m (7 ft 10 in) by 1.2 m (3 ft 11 in) United Kingdom Cranfield University 8'x6' Low Speen Wind Tunnel [17] [23] Operational 2.4 m (7 ft 10 in) by 1.8 m (5 ft 11 in) United Kingdom Part of the UK National Wind Tunnel Facility: Cranfield University Weybridge Wind Tunnel [17] Operational 1.067 m (3 ft 6.0 in) diameter jet United Kingdom
7.2–7.6 meters in diameter (45 m 2 cross section). Part of a wider complex of tunnels that are 72 kilometers in length combined. Water supply Quabbin Aqueduct: Massachusetts, United States 39,600 m (24.606 mi) 1933 Metro Chengdu Metro Line 4: Chengdu, China 39,300 m (24.420 mi) 2015–2017 Metro Chengdu Metro Line 7: Chengdu, China
Tunnel Construction. Tunnels are dug in types of materials varying from soft clay to hard rock. The method of tunnel construction depends on such factors as the ground conditions, the ground water conditions, the length and diameter of the tunnel drive, the depth of the tunnel, the logistics of supporting the tunnel excavation, the final use and shape of the tunnel and appropriate risk management.
6.9 km (4.3 mi) 2024 2 Shanghai North Horizontal Corridor Fenshuiling Tunnel [36] China 6.891 km (4.282 mi) 2013 2 G95 Capital Ring Expressway Tongsheng Tunnel China 6.887 km (4.279 mi) 2015 2 G59 Hohhot-Beihai Expressway Nordkapp Norway 6.875 km (4.3 mi) 1999 1 E69: Maurice Lemaire France 6.872 km (4.3 mi) 1976 [bq] 1
[1] Utility tunnels are also often common on large industrial, institutional, or commercial sites, where multiple large-scale services infrastructure (gas, water, power, heat, steam, compressed air, telecommunications cable, etc.) are distributed around the site to multiple buildings, without impeding vehicular or pedestrian traffic above ground.
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