Cuttle 'fish' all over Shelley beach

A walk on Shelley beach (03.08) at night exposed a beach littered in cephalopoda, you might know it as the "stuffed with…thing". Approximately 13 white cuttle 'fish' each 30- 40 cm long were lying all over the beach. 'Natural stranding?' They have been around for some 542 million years now and are still performing their rituals in the protected Cabbage Tree Bay area. Many large boats came right in in the last days and went about their 'business'. These strandings go unreported. Bait?,boat chemicals or just tangled in nets?
Some more images and information is here. Detailled scientific illustrations of anatomy and morphology of Sepia officinalis are here.