Not familiar with the geography, but just how far were they from the nearest possible dry landing area? Not talking instrument approach, offshore you can chop and drop until you see water. From reading the AAIB report, if this case were similar ( how sad would that be: Bond sinking a perfectly good 30 mil helicopter and nobody learning a lesson) for a "land immediate" they would have required a failure of the EMERG cooling system, otherwise stopwatch it 30 min and consider options. I don't fly the EC225 or L2, so if this sounds ingnorant (in the literal sense) go ahead and say so.