One of Britain’s most well-known archaeological landmarks could soon have a tunnel carved below it. The government unveiled plans for a 1.8 mile tunnel running under Stonehenge as part of a $2.4 billion infrastructure investment, hoping to slash traffic plaguing the area. But not everyone is happy with the government’s plan; some experts believe a tunnel could destroy undiscovered artifacts.

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The British government is planning a $2.4 billion investment for the country’s A303 road, hoping to upgrade it into a “high quality, high performing route” that will improve trips for millions of people, according to the Department for Transport’s statement on the project. Part of the upgrades include a tunnel passing beneath the famous site. Officials say the tunnel would slash congestion and bolster the local economy.

Related: Archaeologists reveal fresh details about 4,500-year-old “New Stonehenge”

English Heritage, the charity managing more than 400 historic sites, backs the tunnel. UNESCO, which in 1986 designated Stonehenge as a World Heritage Site, say they could get behind the idea, but have not yet viewed final plans.

Historian Tom Holland fears a tunnel could destroy the key historical site. He told CNN, “Recent finds show this place is the birthplace of Britain, and its origins go back to the resettlement of this island after the Ice Age. It staggers belief that we can inject enormous quantities of concrete to build a tunnel that will last at best 100 years and therefore decimate a landscape that has lasted for millennia.”

Local chamber of commerce president and Amesbury Museum chairman Andy Rhind-Tutt is also against the tunnel, saying it won’t even really improve traffic and will “put a time bomb of irreversible destruction on one of the world’s greatest untouched landscapes.”

The public can comment on the tunnel plan until March 5, and the government plans to announce the preferred route later in 2017. Construction could start in 2020, according to a Highways England spokesperson, and could be completed in four years.

Via CNN

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