Line 7B of the Madrid Metro will fully reopen this same month of November after more than three years closed. It is the tenth attempt to normalize a service that was inaugurated in 2007 and that has accumulated more than 800 days without functioning since then. The total cost of repairs reaches 171 million eurosnot counting compensation to neighbors, which already exceeds 23 million and continues to increase.
A disaster that began in 2007. When Esperanza Aguirre promoted this expansion to have it ready before the regional elections of 2007, no one could imagine the consequences. The construction of the tunnel seriously altered the subsoil by bringing salt and water into contact, which caused the progressive dissolution of the soil.
The result: collapse of the tunnels, massive water leaks and structural damage to hundreds of homes in San Fernando de Henares and Coslada. According to internal documents obtained by El Paísalready in 2008 the technicians warned of the “risk of collapses in the metro tunnel and the surrounding buildings”, and in 2009 they warned that action was “extremely urgent.”
The figures of the disaster. The repair bill includes 117 million invested by the Ministry of Transport in works and compensation, 49.7 million from the Canal de Isabel II in hydraulic infrastructure, 2.4 million from the Metro itself and 1.7 million from the Ministry of Education to demolish the El Pilar educational complex.
In total, more than 171 million euros. But the number will continue to grow: Property compensation, which in 2022 was estimated at 12 million, has already reached 23.3 million and there are nearly 300 open files. Additionally, 73 homes had to be completely demolished, leaving families paying mortgages on homes that no longer existed.
The technical solution. To stabilize the ground, the Community has injected more than 11,000 tons of mortar of concrete in the subsoil through 26,000 drillings that reach up to 45 meters deep. It has also deployed 179 mini topographic prisms inside the metro and laser sensors that send daily data on ground movements.
The Polytechnic University of Madrid analyzes also satellite images to detect any anomaly. According to the Minister of Housing, Transport and Infrastructure, Jorge Rodrigo, 511 surveillance elements and five robotic stations have been installed that will constantly monitor the road, the land and nearby buildings.
The neighbors don’t forget. Although the Community assures that the infrastructure now presents “stability” and meets “the necessary security conditions”, those affected they maintain their mobilizations and demand greater compensation in court. Furthermore, a study by the Polytechnic University detected “considerable movements” in distant areas “without stabilizing”, although without specifying more details. For the 120,000 inhabitants of San Fernando de Henares and Coslada, the November reopening is just the first step to move forward in almost two decades of nightmare.
And now what. The Community will allocate an additional 8.2 million to surveillance and maintenance contracts to act immediately in the event of any incident without the need for emergency contracts. Line 7B will be the most monitored infrastructure of the Madrid Metro, precisely because it is the one that has caused the most problems. It remains to be seen if this time the line is truly stable or if it will close again, as has happened on nine previous occasions.
Cover image | Zarateman (Wikipedia)
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