Thank you, GreshanH.
I know that it is a juvenile Sepioteuthis lessoniana, the Bigfin Reef Squid. It ranges Indo-Pacific, and found in shallow to deeper (100 meters) waters. See Cephalopods, A World Guide; Octopuses, Argonauts, Cuttlefish, Squid, Nautilus (by Mark Norman, 2000) for detail. I was very lucky to see such a juvenile.