Yes indeed, but what do they see, our friends messie and archi? It is, to all intents and purposes, pitch black at hunting depth. Do they look for disturbances causing bioluminescence? They don't seem to prefer prey which has its own photophores... I recall one Architeuthis specimen being hauled in by fishermen, after they detected a large object on their sonar, hovering 5 meters over a school of hoki at an angle of about 45 degrees. Even if our squid overlords merely respond to fish swimming haphazardly into their clubs, they still need to know where to go in the first place. I now turn to the experts, is there any light left at 600-900 meters below? I was always taught that sunlight will not penetrate past 300 meters below sea level. I also know, however, that i.e. hatchet fish still employ countershading (reinforced by blue bioluminescence!), even at that depth.... I'm all confused now For certain, the recently photographed Architeuthis specimen had a strobe at its disposal. On a secondary note, do we know whether Architeuthis hunts both by day and by night? What do bycatch figures teach us there?