Message aux signatairesInstall special marker lights in the Severn Tunnel at the exact point below the M4 bridge!
Its entirely possible!
Ro---- Ash----- (Mr Easter!)Kingston-upon-Thames, Royaume-Uni
8 mars 2026
Although GPS signals are lost underground, because the bridge crossover is located at a specific distance from the tunnel entrance on the English side, Network Rail engineers can use measurements and accurately pinpoint the location underground from the portal on the English side.
Its entirely possible!
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