Source discipline

Source Audit

Wrong tunnel links are not hidden and not embedded. They are marked here so the public site can stay imaginative without becoming sloppy.

Public checks

Current-source sanity pass

These public and official references were used to spot-check project statuses, lengths, and active-study context before publishing the local build.

Shetland Inter-Island Transport Study

Used to confirm Shetland fixed-link study context and named island options.

Open source

Italian Ministry of Infrastructure - Messina final design approval

Used to update Messina status to final design approved in 2025.

Open source

FinEst Link Helsinki-Tallinn feasibility report

Used to sanity-check the roughly 103 km Helsinki-Tallinn tunnel length and feasibility framing.

Open source

UK Union Connectivity Review

Used to confirm the Irish Sea fixed-link review context.

Open source

India Ministry of External Affairs - India-Sri Lanka relations brief

Used to sanity-check ongoing India-Sri Lanka connectivity discussion.

Open source

Shenzhen Government Online - Qiongzhou Strait ferry suspension

Used to validate the weather-disruption logic behind the Hainan-mainland fixed-link case.

Open source

Needs replacement

Shetland Inter-Island Tunnels

The supplied Doc, PDF, YouTube, and Spotify links point to the Scotland-Denmark corridor rather than the Shetland inter-island fixed links, so they are not embedded.

docmismatchedopenDocument title resolves to the Scotland-Denmark tunnel analysis.
pdfmismatchedopenPDF title references Scotland-Denmark.
youtubemismatchedopenShared with Scotland-Denmark source set.
spotifymismatchedopenShared with Scotland-Denmark source set.

Verified

Hainan-Mainland Tunnel

The supplied Doc, PDF, YouTube, and Spotify links match the Hainan-mainland corridor.

docverifiedopenDocument title matches Hainan-mainland tunnel.
pdfverifiedopenPDF title hainan.pdf.
youtubeverifiedopenProvided as Hainan media.
spotifyverifiedopenProvided as Hainan audio.

Verified

Gibraltar Strait Tunnel

The supplied Doc, PDF, YouTube, and Spotify links match the Gibraltar corridor.

docverifiedopenDocument title matches Gibraltar tunnel research.
pdfverifiedopenPDF title gibraltar.pdf.
youtubeverifiedopenProvided as Gibraltar media.
spotifyverifiedopenProvided as Gibraltar audio.

Verified

Messina Strait Bridge

The supplied Doc, PDF, YouTube, and Spotify links match the Messina crossing.

docverifiedopenDocument title matches the Messina Strait project.
pdfverifiedopenPDF title messina.pdf.
youtubeverifiedopenProvided as Messina media.
spotifyverifiedopenProvided as Messina audio.

Verified

Helsinki-Tallinn Tunnel

The supplied Doc, PDF, YouTube, and Spotify links match the Helsinki-Tallinn tunnel.

docverifiedopenDocument title matches Helsinki-Tallinn tunnel.
pdfverifiedopenPDF title helsinki-tallin.pdf.
youtubeverifiedopenProvided as Helsinki-Tallinn media.
spotifyverifiedopenProvided as Helsinki-Tallinn audio.

Corrected

Setu-Palk Fixed Link

The supplied PDF was swapped with Sunda. The corrected Setu-Palk PDF is embedded here; the Doc, YouTube, and Spotify links match the Setu-Palk corridor.

docverifiedopenDocument title matches the India-Sri Lanka tunnel.
pdfcorrectedopenCorrected from the user list; Drive title is setu-palk.pdf.
youtubeverifiedopenProvided as Setu-Palk media.
spotifyverifiedopenProvided as Setu-Palk audio.

Verified

Irish Sea Fixed Link

The supplied Doc, PDF, YouTube, and Spotify links match the Irish Sea fixed-link concept.

docverifiedopenDocument title matches Scotland-Northern Ireland tunnel.
pdfverifiedopenPDF title celtic.pdf.
youtubeverifiedopenProvided as Irish Sea media.
spotifyverifiedopenProvided as Irish Sea audio.

Partial

Sakhalin-Mainland Tunnel

The supplied Doc points to Djibouti-Yemen and is not embedded. The PDF filename matches Sakhalin-Russia and is embedded as a verified local source.

docmismatchedopenDocument title resolves to Djibouti-Yemen Tunnel Project Analysis.
pdfverifiedopenPDF title sakhalin-Russia.pdf.
youtubeverifiedopenProvided as Sakhalin-mainland media.
spotifyverifiedopenProvided as Sakhalin-mainland audio.

Corrected

Sunda Strait Fixed Link

The supplied PDF was swapped with Setu-Palk. The corrected Sunda PDF is embedded here; the Doc, YouTube, and Spotify links match Sunda.

docverifiedopenDocument title matches Sunda Strait.
pdfcorrectedopenCorrected from the user list; Drive title is sunda.pdf.
youtubeverifiedopenProvided as Sunda media.
spotifyverifiedopenProvided as Sunda audio.

Verified

Scotland-Denmark North Sea Tunnel

The supplied Doc, PDF, YouTube, and Spotify source set matches the Scotland-Denmark corridor.

docverifiedopenDocument title resolves to Scotland-Denmark tunnel analysis.
pdfverifiedopenPDF title Shetland_Scotland-Denmark.pdf.
youtubeverifiedopenProvided as Scotland-Denmark media.
spotifyverifiedopenProvided as Scotland-Denmark audio.

Verified

Sakhalin-Hokkaido Tunnel

The supplied Doc, PDF, YouTube, and Spotify links match the Sakhalin-Hokkaido corridor.

docverifiedopenDocument title matches Sakhalin-Hokkaido tunnel.
pdfverifiedopenPDF title Sakhalin-Hokkaido.pdf.
youtubeverifiedopenProvided as Sakhalin-Hokkaido media.
spotifyverifiedopenProvided as Sakhalin-Hokkaido audio.

Verified

Bering Strait Tunnel

The supplied Doc, PDF, YouTube, and Spotify links match the Bering Strait tunnel.

docverifiedopenDocument title matches Bering Strait tunnel.
pdfverifiedopenPDF title bering.pdf.
youtubeverifiedopenProvided as Bering media.
spotifyverifiedopenProvided as Bering audio.

Verified

Rogov Bridge

The supplied Doc, PDF, YouTube, and Spotify links match the Djibouti-Yemen Rogov Bridge concept.

docverifiedopenDocument title resolves to Djibouti-Yemen Tunnel Project Analysis.
pdfverifiedopenPDF title rogov-yemen.pdf.
youtubeverifiedopenProvided as Rogov media.
spotifyverifiedopenProvided as Rogov audio.