Deep oceans -- Getting there -- Layers of the ocean -- What's it like in the deep?: Pressure -- Light -- Temperature -- Oxygen -- Food -- Landscape -- Hydrothermal vents -- Bioluminescence: Anglerfish -- Hatchetfish -- Deep-sea squid -- Deep-sea snaggletooth -- Endeavor coffin fish -- Chambered nautilus -- Sabretooth -- Orange roughy -- Vampire squid -- Hagfish -- Warty anglerfish -- Deep-sea lizardfish -- Colossal squid -- Sea angel -- Colonial jelly -- Deep-sea radiolarian -- Deep-sea octopus -- Pointy hat jelly -- Gulper eel -- Arctic red jellies -- Hydromedusa -- Cock-eyed squid -- Glass squid -- Deep-sea pompeii worm -- Vent scale-worm -- Giant vent worm -- Vent eelpout -- Deep-sea eusirid amphipod -- Deep-sea cucumber -- Viperfish -- Finned octopus -- Comb jelly -- Pacific seadragon -- Dumbo octopus -- Unknown species -- Deep-sea isopod -- Shelled sea butterfly.