The metro system has become a vital component of urban transportation due to its high efficiency, environmental benefits, and ability to bypass surface traffic congestion. However, rising ridership has brought growing safety and security challenges. In recent years, incidents such as system failures, fires, and malicious attacks have triggered large-scale evacuations under constrained conditions. These emergencies highlight the vulnerability of underground transit systems, where confined spaces and high passenger density significantly increase evacuation risks. Rapid and safe passenger evacuation is critical to minimizing casualties and avoiding secondary disasters, especially when infrastructure is partially compromised [1]. Consequently, assessing metro system vulnerability from the standpoint of evacuation has become a key aspect of safety management.