The IMO Sub-Committee on Carriage of Cargoes and Containers (CCC 10) developed amendments to Resolution A.1050(27) in 2024 to combat the continued loss of life resultant from the hazards of enclosed space entry.

The hazards from lack of Oxygen (O2) and the build-up of gases such as Carbon Dioxide (CO2) and Carbon Monoxide (CO) are well known, but their relationships are not always fully understood. More recent studies show that, as well as Oxygen levels, the levels of Carbon Dioxide and Carbon Monoxide should be checked before entry is made to any enclosed space or adjacent connected space. To emphasize this, CO2 is now explicitly included in the revised Recommendation.