Traces of a Russian hole to hell in the Arctic, a military base in America's wild west, and a strange looming tower are mysterious deserted engineering projects, and new discoveries reveal how they were built and why they were abandoned. Stories: 1) Salton Sea Test Range, California, USA; 2) Kola Superdeep Borehole, Pechengsky, Russia; 3) Canfranc Railway Station, Aragon Valley, Spain; 4) Power Station IM, Charleroi, Belgium
| Name | Type | Role | |
|---|---|---|---|
| David Caldwell-Evans | Producer | Series Producer | |
| Katherine 'Kate' Swanson | Producer | ||
| Rob Bell | Guest Star | Self - Engineer and Adventurer | |
| Daniel 'Dan' Dickrell | Guest Star | Self - Mechanical Engineer | |
| Fernando Sanchez Morales | Guest Star | Self - Mayor, Canfranc | |
| Andrew Gough | Guest Star | Self - Historian and Author | |
| Dougal Jerram | Guest Star | Self - Earth Scientist | |
| Roma Agrawal | Guest Star | Self - Structural Engineer | |
| Leon Lesicka | Guest Star | Self - Salton Sea Resident | |
| Jim Meigs | Guest Star | Self - Author and Journalist | |
| Lynette Nusbacher | Guest Star | Self - Military Historian | |
| Sergei Nesterenko | Guest Star | Self - Russian Engineer | |
| James S. Corum | Guest Star | Self - Military Historian | |
| Bruce Burgess | Executive Producer | ||
| Henry Scott | Executive Producer | ||
| Kyle McCabe | Executive Producer | for SCIENCE CHANNEL | |
| Katherine 'Kate' Swanson | Director |