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Altes Tunnel System

3:25

Old Elbe Tunnel - Short History, Hamburg, Germany, 4k UHD

octavst

4K views

8:49

This Underwater Tunnel Connects Asia To Europe

TheRichest

123K views

5:38

How the world's longest underwater tunnel was built - Alex Gendler

TED-Ed

3.6M views

4:58

How the world's first metro system was built - Christian Wolmar

TED-Ed

1.8M views

10:51

Abandoned Old Subway Terminal & Tunnel Under Los Angeles Urbex Offlimits

Urbex Offlimits

16K views

19:56

The Secret Steam Tunnel System of N.Y.C. (and why it pours out of the street) - IT'S HISTORY

IT'S HISTORY

193K views

8:53

The Secret $5BN Tunnel System Under London

The B1M

567K views

17:11

Dozens of vintage Volkswagens hidden inside a mine | ABANDONED

Exploring the Unbeaten Path

797K views

9:39

Massive Network of European Underground Tunnels - ROBERT SEPEHR

Robert Sepehr

131K views

7:47

NATM (New Austrian Tunneling Method) Tunnel

Suraj Singhania

64K views

9:00

How Does A Mega Tunnel Under The Alps Get Built? | Richard Hammond’s Big

Quest TV

266K views

52:04

Vietnam War, the Last Secrets

Best Documentary

3.4M views

20:10

Secret WW2 tunnel system found INSIDE a tunnel ! Hitlers gold hidden ?

WW2HistoryHunter

244K views

7:48

ABANDONED Underground Concourses of Philadelphia - IT'S HISTORY

IT'S HISTORY

254K views

1:56:00

Pre-Egyptian Technology Left By an Advanced Civilization That Disappeared

Universe Inside You

2.4M views

10:40

High Tunnel System

Minnesota NRCS

51K views

7:51

Secret Marvel: NYC's Pneumatic Mail Tubes

CityXcape

45K views

16:58

Why the Longest Tunnel in the World Leads to New York City - IT'S HISTORY

IT'S HISTORY

211K views

2:10

The New Austrian Tunneling Method (NATM)

Central Japan Railway Company official channel

83K views

5:27

Obere Wasserschlosskammer

Edgar Müller

11M views