<![CDATA[Defense in depth (DiD) at Bandar Lampung Class I Detention Center is running well through five security layers, each with written work procedures. This study analyzes how DiD is applied. A descriptive qualitative design was used. Primary data came from semi-structured interviews with five officers, each representing one of five security layers, and from field observation; secondary data came from security inventory documents and regulations. Analysis followed data reduction, data display, and conclusion drawing, using the physical, technical, and administrative controls of NIST SP 800-53 and Article 32(2) of Ministerial Regulation No. 8 of 2024. All five layers carry out physical, technical, and administrative controls, all CCTV points are functioning, and officers at every layer understand and carry out their procedures. Several equipment and implementation aspects are still under repair and periodic evaluation, as part of the ongoing development of security measures with 1,158 occupants against a capacity of 750. Keywords: defense in depth, security, detention center, overcrowding]]>
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