The study’s objective is to conduct a critical examination of the vulnerable imprisoned lives experiences of Bangladeshi undocumented labour migrants in host countries. Using the qualitative Interpretative Phenomenological Approach (IPA), 25 in-depth interviews were conducted and analysed inductively through Nvivo-14 software. The study’s findings reveal six major themes: insufficient food, bullying and punishment, an embarrassing environment, poor materials and clothes, poor medical access, and providing insufficient water. These themes collectively highlight the significant vulnerabilities and injustices endured by this marginalized population. This research amplifies a marginalized population’s voices and offers empirical evidence to inform evidence-based policymaking. It serves as a foundation for advocating for the rights and well-being of irregular labour migrants. It contributes to creating more equitable and just societies in Bangladesh and globally. This study is crucial for policymakers, NGOs, and international entities striving to formulate more compassionate and effective migration policies.