Mike Bratton
В роли: Narrator (голос)

Luke Bisby
В роли: Self - Phd., Professor of Engineering University of Edinburgh

Adrian Brugger
В роли: Self - Civil Engineer

Jorge de la Guardia
В роли: Self - Contracts Manager

Ilya de Marotta
В роли: Self - Chief Engineer

Luis Ferreira
В роли: Self - Engineer

Cheryl George
В роли: Self - Chief Locks Design Engineering

Tuija Linden
В роли: Self - Restoration Architect Governing Body of Suomenlinna

Robert Maillart
В роли: Self - Civil Engineer (хроника)

Urs Meier
В роли: Self - Engineer

Rhys Morgan
В роли: Self - Phd., Director of Education - Royal Academy of Engineering

Panayotis Papanikolas
В роли: Self - Chief Engineer (как Panagiotis Papanikolas)

Scott Ramsay
В роли: Self - Materials Scientist

Christopher Kit Scruton
В роли: Self - Scientist (хроника)

Suzie Sheehy
В роли: Self - Phd., Accelerator Physicist University of Oxford (как Suzie Sherry)

Andrew Steele
В роли: Self - Physicist