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url: http://www.euronews.com/2026/07/31/europes-mega-landfill-in-the-alps-how-a-v-shaped-valley-became-a-u-shaped-one
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source: euronews
category: news/world
category_raw: top
region: europe
tags:
- general_news
- world_general
lang: en
published_at: '2026-07-31T05:02:45Z'
fetched_at: '2026-07-31T08:19:02.149980Z'
updated_at: '2026-07-31T08:21:06Z'
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- name: THE ANSWER
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- name: World
  type: location
- name: Holmzs Sea Tunnel
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title: What it takes to build the world’s longest railway tunnel – and restore nature
  once it’s done
---

# What it takes to build the world’s longest railway tunnel – and restore nature once it’s done

## TL;DR
（要約なし・原文はリンク先を参照 / No summary available; see the source link.）

## Key Points
- general_news / world_general

## Details
(本文なし。リンク先参照)

## Source
元記事: [What it takes to build the world’s longest railway tunnel – and restore nature once it’s done](http://www.euronews.com/2026/07/31/europes-mega-landfill-in-the-alps-how-a-v-shaped-valley-became-a-u-shaped-one) — published 2026-07-31T05:02:45Z