Confined space fatality

One person died when entry was made into a decommissioned submarine without proper atmospheric monitoring. Most probable cause of the accident was oxygen depletion due to rusting inside the decommissioned sub. Many times, we feel that a decommissioned equipment is safer than an equipment that is in service. We let our guard down and then a fatality occurs. Sometimes, new equipment are brought to the site before a turnaround and placed near the unit. They may be nitrogen blanketed and have to be treated just like any vessel in service. Make sure your maintenance personnel understand this.
Read about the accident in this link.

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