tunneling shield: Quick Facts
Photos
Related Topics and References
Topics
Greathead shieldtunnels and underground excavationsrock boltcaissonair lockimmersed tubeToday in History—May 6: A Tunnel Beneath the Channel Opens
Dig Deeper: More Articles That Discuss This Topic
Key People
Alfred Ely Beach
American publisher and inventor
Sir Marc Isambard Brunel
French-born engineer and inventor
Sir Benjamin Baker
English civil engineer
James Henry Greathead
British engineer