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- Season 1 1993-12-10
- Season 2 1994-12-16
- Season 3 1995-08-20
- Season 4 1996-09-02
- Season 5 1997-08-17
- Season 6 1998-07-27
- Season 7 2000-01-03
- Season 8 2001-01-08
- Season 9 2002-01-02
- Season 10 2003-01-01
- Season 11 2004-01-16
- Season 12 2005-01-05
- Season 13 2006-01-04
- Season 14 2007-01-17
- Season 15 2008-01-07
- Season 16 2010-01-14
- Season 17 2010-10-29
- Season 18 2011-10-03
- Season 19 2013-07-16
- Season 20 2021-02-20
- Season 21 2021-07-25
- Season 22 2021-11-28
- Season 23 2022-02-16
Season 23 Episode
- Season 7 The City Beneath Our Feet
- Season 7 Tower Bridge
- Season 7 The Chunnel
- Season 7 Space Stations.
- Season 7 The Pentagon
- Season 7 Bridges.
- Season 7 Prisons
- Season 7 Great Inventions
- Season 7 Office Wonders
- Season 7 Police Technology
- Season 7 Disaster Technology
- Season 7 Concrete
- Season 7 Camping Technology
- Season 7 Private Planes
- Season 7 Race Cars
- Season 7 Traffic
- Season 7 Buses
- Season 7 Gold Mines.
- Season 7 Banks.
- Season 7 The Erie Canal
- Season 7 Trucks
- Season 7 Aswan Dam
- Season 7 China's Great Dam
- Season 7 The Maginot Line
- Season 7 Video Games: Behind The Fun
- Season 7 The Body Shop
- Season 7 Machine Tools
- Season 7 Farming Technology
- Season 7 Assembly Lines
- Season 7 Suez Canal
- Season 7 London Underground
- Season 7 Combat Training.
- Season 7 Remote Operated Vehicles
- Season 7 Death Devices
- Season 7 Power Plants.
- Season 7 Inventions of War.
- Season 7 Plumbing: The Arteries Of Civilzation
- Season 7 Line of Defense
Modern Marvels - Season 7 Episode 1 The City Beneath Our Feet
7.90 44 minutes Beneath every modern city, hidden by manhole covers, drains, and ventilation grates – lies a labyrinth of tunnels, wires, conduits and pipes. They deliver power to our homes, water to our faucets, messages to our loved ones and sometimes – they even move us. Workers create the secret world beneath our feet using everything from shovels, pickaxes and dynamite to multi-million dollar tunneling equipment. The modern subterranean worker, or as they like to be called, “Sandhogs” use time tested methods as well as modern inventions, such as airlocks and computerized mapping techniques to avoid pitfalls and get the job done in the city beneath the street.
