Favorite this☆ bh017090 Workers with core drill in tunnel, Springwells Station, Detroit water supply system
Favorite this☆ bh016771 Workers building forms and placing reinforcing steel in pipe tunnel, Waterworks Park, Detroit water supply system
Favorite this☆ bh016762 Hole in reservoir wall at end of tunnel, Waterworks Park, Detroit water supply system
Favorite this☆ bh016755 Workers removing section of brick tunnel, Waterworks Park, Detroit water supply system
