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About Us

About Us

What is TAYA Cave Preservation Executive Committee?


 TAYA Cave is an Underground Built Heritage (UBH) site which is very unique in the world. It is more accurate to say that this cave is a 100% artificial, excavated tunnel. It is also very interesting civil engineering-wise, and is considered to have been built using very high level surveying techniques. When you visit this cave from a technical point of view, you cannot help but have a sense of some respect for the 'technical skills of the predecessors who dug the tunnels' and for the 'aesthetic sense of the people who sculpted the enormous number of reliefs'. This cave is a huge civil engineering heritage and our integral and precious intellectual property.

 It can be said that climate change is clearly underway at present. The interior of the Taya Cave is considered to have been deteriorated and weathered in relation to climate change. In some of the world's Underground Built Heritage sites, such as the Lascaux and Altamira caves, due to degradation and weathering, they are now inaccessible to all but researchers.

 The Taya Cave Preservation Executive Committee is a voluntary organisation whose aim is to preserve digital data in order to give this valuable Underground heritage to future generations, with the aim of creating an Area of Co-existence with the Underground heritage. We aim to become a non-profit organisation in the future. In order to protect this Underground Built Heritage, it is necessary to maintain and preserve the surrounding environment. To achieve this, we are considering how the Underground Built Heritage can coexist sustainably and self-governing with the 'satochi and satoyama of the rural areas near cities and the local community, culture and environment', and we are implementing various missions based on three axes.

​Group name

Taya Caves Preservation Executive Committee (voluntary organization)

Representative name

Yasuhiko Tamura (Chairman)


271-1-201 Yabe-cho, Yokohama-shi, Kanagawa 244-0002

Contact address

Main activities

A multidisciplinary cross-disciplinary Taya Caves preservation activity based on the following three axes to create a digital archive of the Yokohama City registered historic site "Taya Caves (Taya Caves)" and pass it on to the next generation.

1. Basic survey to know Taya Caves

2. Community development for Taya Caves and the community to coexist

3. Creating people to foster Civic Pride


[1] 地下文化遺産 (UBH : Underground Built Heritage) :

通常、我国では「文化財」という言葉が使用されています。しかし、田谷の洞窟は地域住民による築造及び維持管理が行われた歴史を持ちます。「文化財」は英語で「Cultural Property」と訳されます。ここで、「Property」は、資産、不動産などの意味であり所有権を伴う財産という意味になります。そこで、私たちは、この田谷の洞窟のような人工的に築造された「地下文化財」を地域社会とのつながりがあってこそ成り立ってきた「地域遺産」と捉えるべきではないかと考え、「地下文化遺産 Undergraound Built Heritage (UBH)」と敢えて呼ぶことにしています。この呼称は、私たちと国際共同研究を進めている「イタリア国立研究会議(Cnr)」で使用されており、ヨーロッパでは広く使われている用語です。私たちは、「財」ではなく「遺産」と考えるべきだと考えます。そして、田谷の洞窟は、人工的に造られた地下空間であるので、この呼び方の方が適切だと考え、「地下文化遺産 Underground Built Heritage」と呼んでいます

Beginning 始まり

Beginning of preservation activity
保存活動のはじまり ~ 発起人挨拶 ~

 When I was a child, my parents took me to various cultural assets, temples, shrines and other tourist attractions, but I don't remember much about them. When you revisit such places as an adult, you encounter completely different impressions and emotions. I think we have all had this kind of experience; it was such a revisiting of Taya Cave in 2015. Again, visiting this Underground heritage with a technical perspective, I found many wonders and impressions that made me pay more respect to the predecessors who worked so hard to build these caves. I wanted more people to know about this Taya Cave and felt that I wanted to take pride in the Taya region and pass it on to the future.

​ With the permission of the 'Josenji-Temple', the administrator of the Taya Cave, this conservation work was started as a volunteer initiative. This preservation work started by a complete amateur in cultural property, and after about a year of searching for experts to help us, we officially established a voluntary organisation called the 'Taya Cave Preservation Executive Committee' in 2017 and started the preservation work in earnest.

​ Today, with the cooperation of a very large number of people, from private specialist companies to university research institutions, we are able to continue our preservation activities in a 'foolish', 'steady' and 'speedy' manner. Furthermore, with the cooperation of the people in the neighbourhood, public primary schools and prefectural high schools, this preservation activity is moving forward in collaboration with a diverse range of people, from children to the elderly. Through these activities, we have been promoting this regional cultural heritage preservation activity as a flagship project for Japan's difficult future, linking 'community design' and 'people development' for regional development in order to sustain a rich regional culture for the next generation.

​ Together with our partners, we would like to continue to carry out diverse activities in co-existence with this Underground heritage. We would be grateful for your support and cooperation.

Executive Committee for the Preservation of Taya Cave

Initiator Chairman

Yasuhiko Tamura

Axes 活動目的

Our Purpose: 3 Axes
動目的 ~ 3つの基軸 ~

Our activities are baced on three axes.



3 axis of our preservation activities

-Three axes of conservation activities (purpose) —
Axis1 基礎調査

Basic Researches to understand TAYA Cave for our future

Axis 1 : 田谷の洞窟の理解(未来につなぐ基礎調査)

We are carrying out 3 categories academical survey for understanding TAYA Cave.


1. Basic administrative survey

Survey of administrative materials at the time of registration of cultural properties (finished)

2. Academic Basic Survey

Multidisciplinary academic research on caves.

3. Basic Survey on Cultural Heritage

Basic research as a cultural property.

Basic surveys are carried out to understand the Taya Cave itself today. Various surveys are carried out, mainly scientific and engineering basic academic surveys of geology, cave environment, spatial shape, geographical position, topography and terrestrial Satoyama environment. In starting these activities, we first carried out a survey of administrative documents in the cultural heritage regime and also carried out a basic survey of cultural heritage, including photographic recording of all reliefs in this cave. We are carrying out various basic academic surveys with multidisciplinary researchers in order to understand Taya Cave as a 'superior structure built by human hands' and to re-evaluate the history and culture of this cave from a more technical point of view.

Axis2 地域づくり

Regional Design of TAYA town for our future

Axis 2 : 田谷の地域づくり(未来につなぐ地域づくり)

Underground Built Heritages are integrated with the ground environment.


In order to protect the Taya Caves, it is important to conserve the satoyama and satoyama in the rural areas near the city that extend to the upper part of the cave. For regional symbiosis, it is necessary to consider regional design.

It is not enough to protect only the underground part for Underground heritage, such as the Taya Cave. The above-ground elements have a very influence on the underground. In particular, the underground water system is very important. So we need to protect the above-ground satoyama and satochi rural landscapes where rainwater soaks into the ground. Therefore, we have to think about creating sustainable regions. Furthermore, preserving the Taya Cave could also make the regional potential stronger.

The town of Taya, an area of rural areas near the city, has both 'urban problems' and 'rural problems'. It can be said that the existence of a dynamic Underground heritage such as the Taya cave there has a very advantageous content. We believe that the successful conservation and appropriation of the Taya Cave will be good for the area around Taya Town. This means that we believe that the preservation of Taya Cave and the creation of the region will be beneficial to both sides. That is why we must think about the coexistence of a huge Underground heritage and the regional community.

Axis3 人づくり

People Developments for our future

Axis 3 : 田谷の人づくり(未来につなぐ人づくり)

Outreach to people to establish the Civic Pride of Taya.

Civic Pride 醸成のための、人々へのアウトリーチ。​

​We must also develop future human resources. It is also an important goal to nurture such a "CIVIC PRIDE (local love)" that bears the community and cherishes this underground cultural property.

The Taya Cave and the climate FUDO of the area as a rural suburban area are very valuable resources of ours. We believe that in order to make sure that these properties are well inherited by the next generation, we need to do something to leave a legacy in people's hearts and minds.

In our activities, we particularly encourage young people to work together. By carrying out joint projects with a wide range of people, from primary school children to university students, we believe that many people will develop an interest in and pride in the Taya Cave and the climate FUDO of this region as a rural, suburban area. In order to achieve this, we would like to leave the underground cultural heritage in people's memories through our preservation activities.

Translated with (free version)

Missions ミッション

Our Mission : actions
ミッション ~ 具体的な活動 ~

We carry out the following four missions.


Mission All

Mission 1 is basic academic researches to understand Taya Caves.


Mission 3 is to investigate the living and coexistence of Taya Caves and the local community.


Mission 2 is to reconfirm the comprehensive value of Taya Cave.


Mission 4 is an initiative to improve the people who create a sustainable future for Taya Cave and the region.

Mission1 基礎調査

​mission 1:Basic Researches  基礎調査

We are conducting three basic researches.


40追 洞窟保存=山保存(Eng)2-低_edited.jpg

Outline of basic survey

Administration Research

① Administrative investigation

Survey for grasping the current situation through discussions with materials and public institutions when registering cultural properties (finished)

② Academic basic survey

Academical Basic Research

Basic survey for grasping the current state of the cave shown below

Geotechnical foundation survey (Soil property · Degradation · Weathering)

②-1 Geotechnical engineering basic survey (soil characteristics / deteriorated weathering)

We are conducting surveys on the soil characteristics of the cave ground and the environment inside the cave.
[Investigation cooperation]
・ Saitama University Graduate School of Science and Engineering Chiaki Oguchi Laboratory

Geography / Terrain / Spatial Basic Survey (Space Grasp)

②-2 Geography / Topography / Space Basic Survey (Spatial Understanding)

We are conducting an image survey to understand the integrated relationship between the cave space shape and the ground topographic space shape.
[Investigation cooperation]
・ Associate Professor Hayakawa, Graduate School of Environmental Science, Hokkaido University
・ Professor Oguchi, Center for Spatial Information Science, University of Tokyo

Basic environmental survey (grasp of satoyama)

②-3 Basic Environmental Survey (Satoyama Understanding)

We are conducting a basic environmental survey of Satoya in the cave and above ground space.
[Survey cooperation] Looking for professional collaborators

Civil engineering basic survey

②-4 Civil engineering basic survey

We are conducting a basic survey of civil engineering technologies such as construction methods (construction methods) and construction tools.
[Survey cooperation] Recruiting professional collaborators (not started)

③ Basic survey of Cultural Heritage

Cultural Property Basic Research

We are conducting surveys on art such as history and relief relief.
[Investigation cooperation]
・ Associate Professor Ogata, Department of Cultural Properties, Faculty of Letters, Tsurumi University (Individual cooperation)

Mission2 再評価と展開

​mission 2:Re-evaluation & Evolution  再評価と展開

After data acquisition, we will verify 3 viewpoints for the next generation.


Revalidation of

Underground Built Heritages



Digital data

precision verification




Verification of

utilization and deployment of digital data




Based on the results of the multidisciplinary basic research, the value of this underground built heritage will be re-evaluated from a unique perspective: the quality of the 3D laser scanning will be investigated carefully and, if necessary, a diverse re-evaluation of value will be aimed at, for example, applying for registration as a Civil and Geological Heritage Site.

Mission3 地域づくり

​mission 3:Regional Design  地域づくり

We aim to coexist with underground built heritages and the local community.



a preservation for Underground Heritage





a maintain of  

Satoyama & Rural



Regional Design



Check Activities

田谷町空撮 (2).JPG

Regional Basic Survey


In order to create a regional co-existence with this underground built heritage, we are conducting basic survey on the attractiveness qualities of rural areas near cities, such as Taya.

(Cooperation: Department of Architecture, Yokohama National University)

(Cooperation:Department of Architecture, Yokohama National University)


Regional Co-existing Projects


We produce returns for donations to preservation activities using a variety products from the satoyama of Taya. The products are produced by various organisations that provide support services for disabled people by local communities. We are developing joint projects between us, the satoyama and welfare.

( Wrinkle project )

Mission4 人づくり

​mission 4:People Developments  人づくり

From Educational Outreach for Civic Pride establishment.

​教育的アウトリーチから Civic Pride 醸成へ







Collaboration Activities




Civic Pride


Civic Pride


Check Activities


Elementary School & University Collaboration Project


We collaborate with university researchers on community learning classes in the 'Period for Integrated Studies' of sixth graders at the local Senshu Municipal Elementary School.


Regional Collaboration Activities


We carry out various activities to coexist with the local community, such as raising preservation activities in the neighbouring areas.

Correlation Diagram : Mandala of our activities
活動の相関図 ~ 活動曼荼羅図 ~

Diagram 活動の相関図

Our activity is developing Rhizome.



Link Link


Check all

協 力

Cooperation 協力

Our activities are supported by a lot of cooperation.



Ricoh Co., Ltd. (360 ° photographing cooperation)
Taito Co., Ltd. (Short movie production cooperation)


Contact Us 問合せ

If you have any enquiries about the Preservation Executive Committee or preservation activities, please contact us using the email form below.

We are sorry, but we do not respond to enquiries by telephone.


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