‘The deep sea will come to me’: The blackwater diver who photographs the creatures of the deep

“Here you can see a juvenile trevally, a kind of jack fish, sitting on the bell of a jellyfish,” says Cai. Inside the jellyfish, you can see a baby octopus is being digested. “Its soft, blood-tinged eyes are visible within the gelatinous stomach. For the baby octopus, this jellyfish is brutal.” For many small zooplankton, said Cai, the jellyfish’s gut becomes their final resting place. For others, like the jack fish, the jellyfish offers refuge.