The World's Most Incredible Undersea Tunnels

Before we get started, we should clarify that most “underwater tunnels” aren’t “underwater” in the sense of being built on the ocean floor. Instead, they’re drilled into the rock underneath the seabed. Some of them aren’t, however...

#MostIncredibleUnderseaTunnels #sideprojects

[michaelcordes]

Simon you've been entertaining me since you had hair, no beard and a questionable dress sense. Thank you

[j.chamberlaindedzul]

I really enjoyed this. I can’t wait to find out if they build the floating bridge. Thanks Simon!

[BradGryphonn]

Australia, particularly Brisbane in Queensland, has embraced tunnel tech. There are road, and soon-to-be-finished rail networks across Brisbane that go under both suburbs and the city, as well as the river. It may be worth looking into the development of the Brisbane tunnel traffic network.

[grahamdauncey]

Fun to see my local commute come up - I actually travel through the Ryfast tunnel to Stavanger every day to go to work! The new tunnels you mentioned (Rogfast and the floating tunnel proposed across Sognefjord) are part of the E39 route project which could be a really interesting video as that includes lots of other tunnels and bridges as well!

[jurellhouston]

Never thought I'd hear a Bainbridge Island name drop in the first 30 seconds of a video from a famous YouTuber. I grew up on the Rock (granted, almost nobody else calls it that) and for all it's faults it will always hold a special place in my heart. Simon & the Sideprojects team, thanks for bringing a smile to my face with that quick shoutout.

Addendum: Awesome video, but I hope to God they never build a tunnel between Bainbridge and Seattle. Not that it's never been mentioned or that it wouldn't be cool to drive underneath the Puget Sound, but the amount of money it would cost is money that can be better spent on hundreds, if not thousands of more useful infrastructure projects.

[andrewjones-productions]

It's a pity that Simon's researchers didn't focus a little bit more on Japan. The 'Tokyo Bay Aqua-Line' is part bridge and part tunnel linking the cities of Kisarazu in Chiba with Kawasaki in Kanagawa. Then there is the second longest road tunnel in the world, the Yamate Tunnel which is 18km long and interweaves with the subway rail network of Tokyo and in some places the tunnels are less than 30cm apart. Simon mentioned that Japan is an archipelago and cited this as a reason for tunnels, but in actual fact, the only tunnel to link the major islands of Honshu, Kyushu, Shikoku and Hokkaido is the Seikan Tunnel (pronounced 'say-can'). Most of Japan's tunnels are due to topography. Specifically, steep mountainous terrain and also as building tunnels is often cheaper and easier than buying land in densely populated areas to create roads and railways.

[PeterShipley]

in the San Francisco Bay area there's a tunnel connecting San Francisco to Oakland ( only 3.6 miles /5.8 km, tiny and short compared to the things discussed in this video)

what is a point of note it was constructed in sections that were floated out into the bay, and sunk.
these submerged/sunken sections were then welded together, the retaining wall opened up and the water pumped out forming an underwater tube.

[C.Fecteau-AU-MJ]

It's not the water that may or not be over my head that fills me with a mild anxiety in such tunnels... They almost never fail. When I'm in any tunnel, especially in a heavy vehicle, fire is the thing on my mind. Ever since the Tullamarine disaster in Melbourne when I was a kid, I've always had this vision of burning to death, trapped in your vehicle. Hell of a way to go

[ellhullio]

I've been thru the Holland Tunnel many times over the decades; going from New Jersey into Manhattan NYC, then back again.
I guess the Holland Tunnel isn't famous enough for this...

[AquaPenguin]

whoa wait, of the american tunnels (or even just the virginia tunnels) you're mentioning the hrbt? the chesapeake bay bridge tunnel is definitely the more impressive of the bridge tunnels around here! it's 17.6 miles long and has two tunnel sections!

[SuperVlerik]

Simon: 'fjord' (Norway) is pronounced 'fee-yord'. A ford is a place where a river goes shallow enough to cross easily on horseback or wheels.

[wildhawk]

Detroit hosts a tunnel under the Detroit River, connecting to Windsor, Ontario. Sort of puts it in league with the Chunnel in terms of connecting two countries.

[WAL_DC-B]

I've taken the Chicago Transit Authority (CTA) subway trains underneath the Chicago River countless times.

[peterwoodhouse]

No glass tunnel shown in the notice? Disappointed but still enjoyed. Very interesting.

[kensims]

I have to say that I been a fan of your channels... I learned more from you than I did 12 years in school and two years in college... Hope success for you and your family...

[espedeze]

I live about 300m away from the Ryfast tunnel. It's quite the boring drive, however there is a section in the middle where it opens up to a small "cave" with lights that change color every day. Always fun to play "guess which color it is today" with my son.

[Lcngopher]

The detroit windsor tunnel the second busiest international crossings in the us. It is just behind the ambassador bridge which is also from detroit to windsor. This makes detroit to windsor and vice versa the single busiest international crossing on that border. A large amount of the traffic tends to be commercial trucks as ive seen long lines of them on the bridge when ive driven past it

[luciusrammer]

I lived on Bainbridge for quite some time, and it's actually amazing how your internal clock becomes a ferry schedule.

[AeroGuy]

My Danish wife is amused by your pronunciation of Danish words. But don't worry, she still laughs at mine, even after 23 years.

[EmilyJelassi]

Fascinating video! I’ve seen some of the wild bridges, but I had no idea that Scandanavia has so many underwater tunnels. Well done Simon and team 😊👏🏻💯🙌🏻