Les 23 et 25 septembre 2015
Balades entre ombre et lumières dans la chaîne de l’Estaque, d’abord sur le rocher du Moulon pour profiter du crépuscule sur la baie de Marseille, puis dans le tunnel du Rove pour explorer cet impressionnant ouvrage d’art inauguré en 1927 et abandonné en 1963 suite à l’effondrement d’une portion de sa voûte.
panoramiques vers Marseille et la Bonne Mère
les tours et îles de l'Erevine au crépuscule
le bleu se lève sur Marseille
Ce tunnel de canal, parmi les plus grands et longs au monde, permettait un trafic entre l’étang de Berre et la rade de Marseille ; des travaux sont actuellement envisagés pour recréer une circulation d’eau dans le tunnel et alimenter l’étang du Bolmon à Marignane.
https://fr.wikipedia.org/wiki/Tunnel_du_Rove
L’ambiance dans ce tunnel fermé depuis plus d’un demi-siècle vaut une balade malgré un accès - normalement interdit - non trivial depuis l’entrée nord à Marignane, et on découvre dans les quelques centaines de mètres où les banquettes latérales ne se sont pas effondrées une ambiance un peu post-apocalyptique faite de clair obscur, de parois couvertes de concrétions et de mousses autour d’une eau saumâtre… Les longueurs de stalactites apparemment proches du mètre montrent d’ailleurs une vitesse de croissance de l’ordre du cm/an, « bientôt » des concrétions qui barrent le canal ?
l'entrée nord du tunnel du Rove à Marignane
le tunnel et ses trottoirs latéraux parfois effondrés
des stalactites au plafond...
... des concrétions sur les côtés...
... des mini-gours sur les trottoirs...
de rouille et d...
... de mousse !
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