Question 1

During a rescue, the recovered casualty is unconscious but breathing once brought to fresh air. What should happen next?

Accepted Answer

Place in the recovery position, monitor airway/breathing/circulation continuously, administer oxygen if trained and available, and arrange urgent medical evacuation/advice (e.g. via TMAS) — do not assume recovery just because they are breathing Toxic gas or oxygen-deficiency exposure can cause delayed complications (e.g. pulmonary effects from some toxic gases, cardiac strain from hypoxia) even after apparent recovery. Continuous monitoring and a proper medical pathway, including TMAS/telemedicine advice and likely evacuation, is required — "they seem okay now" is not a safe endpoint.

Question 2

Under MSC.581(110), what is the maximum acceptable CO2 reading (by volume) before an enclosed space can be considered safe for entry?

Accepted Answer

Less than 0.5% by volume (5,000 ppm) Para. 7.4 sets the CO2 exposure limit at below 0.5% by volume (5,000 ppm) before entry; if this is not achieved, the space remains unsafe. CO2 is now explicitly addressed as a major asphyxiation hazard alongside oxygen depletion.

Question 3

Under the revised recommendations, is single-person entry into an enclosed space ever permitted?

Accepted Answer

No — the company must ensure single-person entry into an enclosed space is not permitted Para. 3.11 explicitly prohibits single-person entry into an enclosed space under any circumstances covered by the recommendation.