(www.MaritimeCyprus.com) Despite detailed IMO recommendations setting out safety precautions for fumigating vessels’ cargo holds, casualty investigations continue to reveal critical gaps in training, gas monitoring, and risk awareness - leaving crews exposed to life-threatening hazards during in-transit fumigation. Fumigation is the process of releasing toxic gases (pesticides) into a cargo hold or compartment for the purpose of eliminating or avoiding infestation by insects or other pests that may cause the cargo to deteriorate. Fumigation may take place either prior to and/or after loading the cargo. In-transit fumigation is preferred by shippers and charterers because it reduces time in port. In recent years there has been a significant increase in the number of marine casualty incidents related to in-transit fumigation. Phosphide tablets are designed to react with moisture in the air and release Phosphine gas, to kill off any insect infestation in the cargo. Investigation reports into these serious casualties frequently highlight a number of recurring lessons learned, including: Inadequate pre-loading and post-fumigation inspections – failure to properly seal the cargo holds, and test the gas-tightness of ventilation trunks, shared bulkheads, and electrical conduits, allowed fumigant gases to migrate into accommodation or work areas. Limited awareness of ventilation dynamics – changes in ventilation system airflows created negative pressures in otherwise safe spaces, drawing fumigant gases inward. Insufficient or ineffective gas monitoring – periodic gas checking regimes or equipment failed to detect residual or migrating gases. Crew unfamiliarity with fumigant exposure symptoms – early signs of phosphine poisoning were mistaken for other illnesses such as food poisoning or seasickness, delaying appropriate response. Unsafe entry into fumigated holds – crew or port workers entered without prior atmosphere testing and without using breathing apparatus. In these c