Worker in a concrete shaft

1280 × 1024

tunnel under construction

3840 × 2400

tunnel construction interior

3840 × 2160

Tunnel construction site

1600 × 1200

Concrete Tunnel Interior — Black, Dramatic, Photograph

1680 × 1050

Concrete tunnel interior

2048 × 1280

concrete tunnel interior

1920 × 1080

concrete tunnel interior

2080 × 1544

Excavation in snowy canyon

1200 × 952

Underground tunnel construction site

1920 × 1278

Underground construction site

1200 × 900

concrete beams under construction

5184 × 3456