Shifting 650,000 cubic metres of waste material from one side of the A6 at Dove Holes to another was no mean feat - and required the construction of what was in 1974 the largest underpass in Britain.
The enormous spoil heap at Bibbington was being used to fill the unused Victoria quarry on the other side of the main road, as part of a massive land reclamation scheme. The green fields that line the road today are testament to the success of the project.
It required a huge tunnel to be built under the A6, capable of accommodating the largest earth scrapers and dumper trucks in existence. Measuring six metres tall and seven metres wide, it cost around £25,000 to build.