As Europe’s migration system becomes increasingly digital, vast amounts of biometric and personal data are collected and shared across interconnected EU databases. But how can an asylum seeker or irregular migrant access, correct, or erase their data within this complex web? This book explores access to justice in the interoperable Eurodac system, examining rights to information, data access, rectification, erasure, and effective remedy. It highlights key data protection and due process challenges in this digitised system and extends the analysis beyond the EU, considering implementation in Schengen/Dublin-associated states like Switzerland and developments in EU accession countries integrated into the EU’s migration data framework.