They say cracks began appearing in walls as the tunneling progressed and now fear there could be consequences for the structural stability of their buildings. In recent weeks, residents have also reported water emerging in the basements of apartment buildings, adding to their concerns. Legal Action and Ongoing InvestigationA preliminary investigation into the reported cracks and ground subsidence remains underway. Meanwhile, residents have sent a formal legal notice to Hellenic Metro and the construction consortium involved in the project. In the legal notice, residents argue that cement that surfaced on Kypseli streets last April “was only the tip of the iceberg.”