I have unfortunately seen several helicopter evacuations, most recently in February on constellation.(below) With a forward facing room, the helicopter was hovering practically in front of me. I have also seen one case where a copter landed on the bow of a ship. One thing I remember vividly about that incident was the number of crewmembers on deck who were completely donned in hazmat suits with firefighting equipment in case something terrible had happened and the copter had crashed.
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