@narcity that "smooth rock" you're looking at is shotcrete. They didn't smooth the natural rock. They use a layer of reinforcement concrete over it to keep loose sections from falling.
According to my research, there was in fact a shaft and stairway access connecting to this portion of the original tunnel when it was first excavated between 1912-1913. This shaft and stairway was presumably created with a view toward the future when and if a station were to be established at this location. During World War II, as a prevention to prevent potential sabotage to the tunnel by foreign agents, a Canadian Army soldier was posted at surface level at the entrance to this shaft-stairway. Although I do not have the precise, documented proof, I suspect that this original entrance still exists inside that small, yellow-bricked building located behind the gates across the street and to the east of the university's arena. More research is needed. Providers welcome.
Any geologists out there I need some help with this. The guy says they are building this in limestone and says it's very hard and the only way is to blast it. So correct me if I'm wrong but limestone has a moh of 3, isn't that soft?
Not a geologist but limestone density varies widely based on age/pressure, environment. It can be relatively soft, with a Mohs hardness of 2 to 4 but really dense limestone can have a crushing strength of up to 180 MPa. Montréal sits on the Canadian Shield which has the oldest exposed Precambrian rock in the world. It was compacted under glacial ice for 2m years. The limestone in MTL is some of the densest in the world the limestone is roughly 450 million years old.
It is soft. However the crushing strength is 180MPa which is high. Concrete is 40MPa. So it's very sturdy. When drilling, due to it's softness it creates a fine powder that trap the drill easily. So they have to drill shallow. The dust it creates is difficult to extract from the mine.
I find it amazing that 100 years ago the Metro technology that was used all around the world seems to have been.... More efficient one could say... Not that these guys aren't doing a great job I am sure that they are but just comparing the tech that was available a century ago vs. today and what is being accomplished.
That is pretty cool.
"Its hard to put into video the scale of how massive these tunnels are" Maybe a video above 480p would help ;)
Good point, that's on us due to some tech issues. Thanks for bringing it up though, we'll make sure this doesn't happen again.
Why am I seeing it in 480p 🤔🤔🤔
Just turn your setting to higher quality 🙂
1:10 just realized that that’s reece from RMtransit
Montrealers are going to dig this new station! So cool
I see what you did there 😌😌
🙃
@narcity that "smooth rock" you're looking at is shotcrete. They didn't smooth the natural rock. They use a layer of reinforcement concrete over it to keep loose sections from falling.
thanks for the insight dd!
According to my research, there was in fact a shaft and stairway access connecting to this portion of the original tunnel when it was first excavated between 1912-1913. This shaft and stairway was presumably created with a view toward the future when and if a station were to be established at this location.
During World War II, as a prevention to prevent potential sabotage to the tunnel by foreign agents, a Canadian Army soldier was posted at surface level at the entrance to this shaft-stairway.
Although I do not have the precise, documented proof, I suspect that this original entrance still exists inside that small, yellow-bricked building located behind the gates across the street and to the east of the university's arena. More research is needed. Providers welcome.
Cet ascenceur est mon pire cauchemar. Bien joué @Alex! Adoré cette vidéo ❤️🙏🏻
WOW!! That's massive
Thanks for sharing 🙏🏾
NarcityWow!! 🎥
Would you feel claustrophobic at 70 meters underground?
Amazing 👏
It is so cool 😍 😎
What did they do with the limestone from the tunnels?
I don't recall any mention of masks when the REM was announced in 2016.
Is there any way regular people can get in
Hi Yahya - this underground tour was organized for media and was not open to the general public.
this feels like "Targu Ocna salt mine" in Romania
C'est trop excitant!
"the end of fall 2023" aka end of 2026, beginning of 2027
It’s just like normal construction site but underground not like aliens. And whatsup with this music.
Any geologists out there I need some help with this. The guy says they are building this in limestone and says it's very hard and the only way is to blast it. So correct me if I'm wrong but limestone has a moh of 3, isn't that soft?
Not a geologist but limestone density varies widely based on age/pressure, environment. It can be relatively soft, with a Mohs hardness of 2 to 4 but really dense limestone can have a crushing strength of up to 180 MPa. Montréal sits on the Canadian Shield which has the oldest exposed Precambrian rock in the world. It was compacted under glacial ice for 2m years. The limestone in MTL is some of the densest in the world the limestone is roughly 450 million years old.
It is soft. However the crushing strength is 180MPa which is high. Concrete is 40MPa. So it's very sturdy. When drilling, due to it's softness it creates a fine powder that trap the drill easily. So they have to drill shallow. The dust it creates is difficult to extract from the mine.
Its not a 25 storey building. ITS ONLY 15 STOREYS DEEP. Where are my Geoff fans at.
Buddy, nose inside the mask.
Mask police
I find it amazing that 100 years ago the Metro technology that was used all around the world seems to have been.... More efficient one could say... Not that these guys aren't doing a great job I am sure that they are but just comparing the tech that was available a century ago vs. today and what is being accomplished.