| anglerfish | | The scientific term for the Abyssal Zone. |
| luciferin | | An excess chemical created in the process of bioluminescence. |
| hades | | The life-giving "suns" of the deep sea. |
| bioluminescence | | The skin of the giant tube worm. |
| pressure | | The other chemical used in the process of bioluminescence. |
| abyssalpelogic | | The Greek god affiliated with Hadal Zones. |
| geothermalvents | | The primary consumers of the deep. |
| chitin | | The deepest trench on Earth. |
| oxyluciferin | | The "producers" of deep marine food pyramids. |
| marianastrench | | A cephalopod that can transform into a spiky ball. |
| death | | A creature's ability to use artificial light. |
| luciferase | | The scientific term for the Hadal Zones. |
| spermwhale | | The reason why humans cannot explore the deep seas. |
| vampiresquid | | The best defense mechanism for most deep sea creatures. |
| photophore | | A good example of a user of bioluminescence. |
| chemosyntheticbacteria | | A giant squid's favorite meal. |
| hadalpelogic | | The mythological Kraken is one of these. |
| gianttubeworms | | One chemical used in the process of bioluminescence. |
| camouflage | | The term commonly used to describe the deepest hadal zones. |
| giantsquid | | A small organ that can produce light (found on vampire squid). |