Bell Common is a settlement in

Essex Essex () is a county in the East of England. One of the home counties, it borders Suffolk and Cambridgeshire to the north, the North Sea to the east, Hertfordshire to the west, Kent across the estuary of the River Thames to the south, and Grea ...

England England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea to the southwest. It is separated from continental Europe b ...

and forms the southern part of the town of

Epping Epping may refer to: Places Australia * Epping, New South Wales, a suburb of Sydney ** Epping railway station, Sydney * Electoral district of Epping, the corresponding seat in the New South Wales Legislative Assembly * Epping Forest, Kearns, a he ...

Tunnel

The Bell Common Tunnel is a covered section of the M25 motorway in Bell Common. The route of the motorway at this point was forced into a very narrow gap between the ecologically important

Epping Forest Epping Forest is a area of ancient woodland, and other established habitats, which straddles the border between Greater London and Essex. The main body of the forest stretches from Epping in the north, to Chingford on the edge of the London ...

to the south and the settlements to the north. The decision was therefore made to put the motorway underground. The tunnel is 470 metres long and was constructed between 1982 and 1984 using the

cut and cover A tunnel is an underground passageway, dug through surrounding soil, earth or rock, and enclosed except for the entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube cons ...

method.Details of the construction
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References

{{reflist Epping Forest District