Tokyo is prone to natural disasters such as earthquakes and flooding. Discover the most advanced disaster prevention technologies hidden throughout the city.
-
0m 00s
Japan has a long history of natural disaster.
-
0m 04s
Now, the power of science is helping to overcome them.
-
0m 07s
BOSAI: Science that Can Save Your Life.
-
0m 16s
Tokyo: it is one of the largest cities in the world.
-
0m 22s
Business.
-
0m 24s
Tourism.
-
0m 27s
Art.
-
0m 29s
Every year, a total of over 500 million people visit Tokyo.
-
0m 35s
The number of residents has surpassed 14 million.
-
0m 44s
Tokyo is one of the most densely populated cities in the world,
-
0m 48s
and it is also prone to natural disasters, such as earthquakes and flooding.
-
1m 00s
It is said that there is a 70% probability of a major earthquake directly striking Tokyo within the next 30 years.
-
1m 10s
Tokyo sits directly on top of a complex tectonic structure made up of various plates.
-
1m 22s
The area is also prone to flood damage, due to the many rivers flowing in from the surrounding mountains.
-
1m 30s
The risk has increased in recent years, as heavy rain and typhoon have intensified.
-
1m 40s
That's why in Tokyo, you'll find the most advanced disaster prevention technologies,
-
1m 45s
integrated into buildings, parks, and underground spaces throughout the city.
-
1m 58s
Today's episode is "BOSAI: Tokyo Metropolis."
-
2m 01s
Discover a side of Tokyo you never knew existed.
-
2m 08s
The dazzling lights of Tokyo at night.
-
2m 12s
Among them, there is one particular building that stands out.
-
2m 20s
The Roppongi Hills tower.
-
2m 25s
Standing 238 meters high, the Tower houses offices, commercial establishments, and even an art museum.
-
2m 34s
It is one of Tokyo's most iconic buildings.
-
2m 39s
This structure, in fact, represents the consolidation of Japan's expertise in disaster prevention technologies.
-
2m 47s
TOYAMA Kai was in charge of the structural engineering for the building.
-
2m 55s
The structure was built
based on the concept of creating -
2m 58s
"a place of refuge
in the event of a disaster." -
3m 03s
Today, I'll introduce 3 features.
-
3m 06s
Yes, please.
-
3m 16s
- This way, please.
- Thank you. -
3m 20s
And this place is?
-
3m 21s
This is the mechanical room.
-
3m 26s
I want to show you
something in the back. -
3m 32s
I hear some noise.
-
3m 42s
What is this?
-
3m 44s
It's a damper and is key to protecting
the building from earthquakes. -
3m 52s
A damper is a device that is designed to change its shape during an earthquake, to absorb the energy of the vibrations.
-
4m 02s
In Japan, dampers were installed in high-rise buildings starting from around the 1980s.
-
4m 09s
At Roppongi Hills, as many as 548 dampers have been put in place to prepare for future tremors.
-
4m 18s
It's quite big.
-
4m 21s
Yes, about 2 arm lengths.
-
4m 24s
Yes.
-
4m 28s
The dampers demonstrated their high performance during the Great East Japan Earthquake, that struck in 2011.
-
4m 36s
The magnitude 9.0 earthquake caused intense shaking.
-
4m 41s
Strong shaking was also felt in Tokyo's high-rise buildings.
-
4m 47s
However, the upper floors of Roppongi Hills did not experience much tremor.
-
4m 55s
In a restaurant on the upper floor,
-
5m 00s
not a single glass of wine fell over.
-
5m 06s
We have the technology to deal with earthquakes,
so people should feel safe coming to Japan. -
5m 18s
This way, please.
-
5m 24s
What a large storage space!
-
5m 30s
It's the size of a 25-meter pool.
-
5m 36s
- Look at the number of boxes!
- Yes. -
5m 40s
The supplies include enough food for roughly 100,000 meals, 5,000 aluminum blankets, medicine, baby formula, and diapers.
-
5m 53s
There are also special meals for seniors, people with allergies, as well as halal food.
-
6m 05s
We've agreed with the local government
to accommodate 5,000 people. -
6m 10s
We've prepared enough food and water
to last 3 days. -
6m 22s
What is the third bosai feature
of Roppongi Hills? -
6m 28s
It's our very own system called
the Disaster Management Portal. -
6m 34s
How does this Disaster Management Portal work?
-
6m 40s
When a large-scale disaster occurs, damage can be expected at various locations inside the facility.
-
6m 50s
For example, a massive earthquake may cause people on the top floor to fall over and get hurt,
-
6m 58s
there may be a fire in a restaurant, or people could get trapped if the elevators stop.
-
7m 07s
It would be difficult to identify all the damages that occur simultaneously in such a large building.
-
7m 15s
The Disaster Management Portal System was developed to address such issues.
-
7m 22s
The system gathers data on the extent of damages, stockpile,
-
7m 30s
and conditions in and around the facility to ensure a swift response.
-
7m 37s
Our primary concern is the safety of people.
-
7m 43s
Are people trapped?
Is there elevator damage? -
7m 48s
This is what the system will tell us.
-
7m 53s
The building was built to serve as
a refuge during disasters. -
7m 59s
I hope it will continue to play that role
for the community. -
8m 10s
Today's episode is "BOSAI: Tokyo Metropolis."
-
8m 14s
Some of the secrets to protecting this city from disasters can be found underground.
-
8m 20s
- "Hello."
- "Thank you for having us." -
8m 22s
"Thank you for coming."
-
8m 25s
This is MUKOUYAMA Kimihito, the manager of this construction site.
-
8m 31s
I'm told that the secret to protecting
Tokyo can be found underground. -
8m 37s
Yes, let me show you.
-
8m 41s
It's hard to imagine what's down there.
-
8m 45s
You can look forward to it.
We'll take this elevator. -
8m 48s
Oh, an elevator.
-
9m 00s
It's really deep!
-
9m 05s
We're headed 40 meters down.
-
9m 10s
Stepping out of the elevator, there was a vast space before us.
-
9m 17s
What is this place?
-
9m 20s
This is an underground
flood control reservoir. -
9m 22s
A flood control reservoir?
-
9m 26s
When a large amount of rain falls in a short period of time due to a typhoon or torrential rain,
-
9m 33s
it can overwhelm the drainage system, causing water to overflow onto roads and buildings.
-
9m 41s
That is why massive underground spaces were created to temporarily store water.
-
9m 48s
The water is then released into the rivers or the ocean, after the rain subsides.
-
9m 55s
This is the front of the tunnel.
-
10m 00s
We've walked quite a bit.
How long is the tunnel? -
10m 07s
This is about 700 meters
from the entrance. -
10m 13s
How big is this massive tunnel?
-
10m 18s
The inner diameter is 12.5 meters.
-
10m 25s
It would be able to handle rainfall of up to 75 milimeters per hour.
-
10m 30s
How exactly is the tunnel being made?
-
10m 34s
When the tunnel is complete,
-
10m 36s
it will be the largest flood control reservoir in Japan, with a capacity to store 1.43 million tons of water.
-
10m 45s
In front of us is the tunnel boring machine.
-
10m 52s
A tunnel boring machine!
-
10m 55s
A tunnel boring machine is a special machine used to excavate tunnels.
-
11m 00s
At this site, they are using a giant machine with a diameter of over 13 meters.
-
11m 08s
Meanwhile, various measures are being taken to ensure the safety of the many people living above the construction site.
-
11m 18s
To prevent the ground from collapsing
during excavation, -
11m 24s
water is applied on the tunnel face
to maintain a balance of pressure. -
11m 32s
When digging into the ground, the weight of the earth and groundwater causes the soil to collapse.
-
11m 42s
Here, the machine pumps slurry in the direction that it is digging.
-
11m 47s
This is the way they prevent soil from collapsing.
-
11m 55s
At the same time, segments are assembled into a ring shape, on the inner side of the tunnel, to prevent ground collapse.
-
12m 03s
Currently, construction is underway with the goal of operating the 13.1-kilometer underground tunnel as soon as possible.
-
12m 13s
The government is spending approximately 100 billion yen on this project.
-
12m 18s
Tokyo has a colossal facility underground designed to protect the city from flooding.
-
12m 25s
This facility cannot be rebuilt, so
we're making it to last over 100 years. -
12m 36s
Measures for disaster preparedness can be found even in everyday places.
-
12m 44s
We're at a nice spacious park.
-
12m 46s
I hear there are special features for disaster prevention hidden throughout the park.
-
12m 50s
Let's go and look for them.
-
12m 53s
- Hello.
- Hello. -
12m 55s
Can I help you?
-
12m 57s
I was looking for disaster prevention
features in this park. -
13m 03s
It must be the stove bench.
-
13m 06s
A stove bench?
-
13m 10s
I'll show you.
-
13m 13s
That looks like an ordinary bench.
-
13m 26s
Wow! That's so easy!
-
13m 31s
Yes, it turns into a portable stove.
-
13m 37s
A folded stove is stored inside the park bench, and it can easily be assembled.
-
13m 46s
There are eight stoves in the park, and during disasters,
-
13m 50s
they can be used to prepare meals for people who have come to evacuate.
-
13m 58s
In addition, there are wells that can pump water when the water supply is cut off,
-
14m 07s
and even a power generator that can last for more than 72 hours.
-
14m 15s
A number of disaster preparedness features can be found hidden throughout the park.
-
14m 23s
- Japan faces many disaster risks.
- Yes, that's right. -
14m 27s
I hope to share these technologies
and ideas with others. -
14m 35s
Tokyo is one of the most popular destinations for tourists.
-
14m 40s
Behind this glamorous city, we found cutting-edge measures being taken to prepare for disasters.
-
14m 46s
We hope to see you all in Tokyo one day! Goodbye!