Large Box Jelly Fish

I regularly spearfish at night here in Madang PNG and see lots and lots of jellyfish and other jelly creatures. The sighting in reference was a medium sized Chironex fleckeri (I'm not positive on that ID but it looks just like it). < 1m of water. In the two years of diving here I've seen 6 of these total 5 last year, one this year.