Which of the below spaces on deck and machinery spaces are most vulnerable for smuggling drugs and contrabands?

Ventilation ducts provide concealed and often extensive internal pathways, making them highly vulnerable for hiding illicit goods due to their less frequent and difficult inspection access. Open walkways, purifier drip trays, and boiler platforms are generally visible and more routinely monitored areas.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Security Training for Seafarers with Designated Security Duties (STSDSD).