The tunnel under Gateshead, was bored through sandstone and excavated coal seams; old coal mine workings, some of which dated to the middle ages had to be filled in before the tunnelling began.
Old coal mine workings, some of which dated to the middle ages had to be filled in before the tunnelling began. The tunnel under Gateshead, was bored through sandstone and excavated coal seams.
The tunnel under Gateshead, was bored through sandstone and excavated coal seams. Old coal mine workings, some of which dated to the middle ages had to be filled in before the tunnelling began.
The tunnel under Gateshead, was bored through sandstone and excavated coal seams. Old coal mine workings, some of which dated to the middle ages had to be filled in before the tunnelling began.