Work to stop a disused railway tunnel collapsing has finished at a cost of £7.2m, officials have said.
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The 1.4-mile (2.25km) Queensbury Tunnel connects Holmfield, Halifax and Queensbury, on the edge of Bradford, beneath the Pennines in West Yorkshire.
National Highways said its lining had been strengthened to prevent any more "uncontrolled collapses".
Campaigners want the tunnel to become a traffic-free "greenway" and said the work was a "monumental waste of time".
The Queensbury Tunnel Society (QTS) said the £7m spent on securing the tunnel could have been put towards making it into a cycle route to be used for generations.
Graeme Bickerdike from the society said: "The past three years have been a monumental waste of time for the taxpayer.
"They came here with the intention of spending £550,000 over three or four months.
"They are leaving having spent more than £7m over three years, and the condition of the tunnel hasn't improved.
"They say it has been stabilised, which it probably has, but whether that was necessary is a matter of considerable argument."
He said there was a "lack of vision" within National Highways which was failing to prioritise sustainable transport.
"If we are serious about tackling the challenges of climate change and improving sustainable transport, a sensible investment has to be made, bringing this tunnel back into use and creating that active travel route."
A Department for Transport spokesperson said it had considered bringing the tunnel into public use and would publish its findings "in due course".