Based on recent updates from USCG and NFPA, we now know that two days after the incident, a marine chemist arrived on the scene in Alaska and tested the atmosphere of the barge involved in the accident. But the atmosphere therein had been sufficiently ventilated to allow firefighters to enter and recover the body of the worker. So, in an effort to determine the condition of the atmosphere of the port-side barge before the workers entered, Coast Guard personnel and the marine chemist tested the atmosphere of the not-yet-opened starboard-side barge.