Measures to Address the Revised Recommendations for Entering Enclosed Spaces Aboard Ships (MSC.581(110)) We have received the information regarding measures to address the Revised Recommendations for Entering Enclosed Spaces Aboard Ships from ClassNK.   At the 110th session of the Maritime Safety Committee (MSC 110) held in June 2025, the Revised Recommendations for Entering Enclosed Spaces Aboard Ships were adopted as IMO Resolution MSC.581(110). This resolution invites the Assembly to revoke resolution A.1050(27) and aims to prevent fatalities and serious accidents related to enclosed space entry by clarifying requirements for definitions, risk assessment, atmosphere testing, carbon dioxide (CO2) management, and emergency preparedness.   For details of the amendments, please refer to the ClassNK Technical Information .   In light of these revised recommendations, we would like to reiterate the importance of safety measures during enclosed space entry. Most accidents are caused not by equipment failure, but by human factors such as procedural shortcuts or complacency. Based on lessons learned from past incidents, Members are advised to pay particular attention to the following points:   1. Combating "Normalisation of Deviation" Casualty investigations frequently reveal that unsafe practices were not isolated incidents but had become habitual. When shortcuts—such as skipping safety checks or entering without proper PPE due to time constraints—are repeated without immediate negative consequences, they gradually become accepted as standard practice (“normalisation of deviation”). To break this chain of invisible risk, it is essential to foster a Safety Culture where strict adherence to basic procedures is the norm and where crew members feel empowered to correct each other's unsafe behaviors.   2. Strict Implementation of Risk Assessment and Master's Verification Risk assessments must be conducted by the Responsible Officer or Safety Officer,