A terrifying sea fortress, a highway in the Amazon that suddenly vanishes, and a mysterious structure in the shadow of the Statue of Liberty are deserted engineering projects; discoveries reveal how they were built and why they were abandoned. Stories: 1) Petrobras Viaduct, São Sebastião, Brazil; 2) Patarei Prison, Tallinn, Estonia; 3) Ellis Island, New York Bay, USA; 4) Ouvrage Restefond, Col de la Bonnette, France
| Name | Type | Role | |
|---|---|---|---|
| David Caldwell-Evans | Producer | Series Producer | |
| Katherine 'Kate' Swanson | Producer | ||
| Daniel 'Dan' Dickrell | Guest Star | Self - Mechanical Engineer | |
| Jim Meigs | Guest Star | Self - Author and Journalist | |
| Newton Jose Cavalieri | Guest Star | Self - Brazilian Engineer | |
| John McInnes | Guest Star | Self - Save Ellis Island | |
| Rob Bell | Guest Star | Self - Engineer and Adventurer | |
| Roma Agrawal | Guest Star | Self - Structural Engineer | |
| Lynette Nusbacher | Guest Star | Self - Military Historian | |
| James S. Corum | Guest Star | Self - Military Historian | |
| Andrew Gough | Guest Star | Self - Historian and Author | |
| Martin Andreller | Guest Star | Self - Curator, Estonian Historical Memory | |
| Kyle McCabe | Executive Producer | for SCIENCE CHANNEL | |
| Bruce Burgess | Executive Producer | ||
| Henry Scott | Executive Producer | ||
| Katherine 'Kate' Swanson | Director |