Location: School of Fish
Depth: 343
Depth: 343
Answer: ANKLES
Each of the words can be paired with another word, and a third element that is “in the middle” (chronologically, geographically, or canonically) can be written at the midpoint between the words.
| Pair given | Middle word | Category | |
| Mammalia | Leporidae | Lagomorpha | classification of animals order in middle of class and family |
| Iapetus | Pyrrha | Epimetheus | in terms of greek mythos family tree |
| Bromley | Newham | Greenwich | geographical boroughs of London |
| Carbon | Germanium | Silicon | reading down periodic table |
| Monrovia | Conakry | Freetown | capitals of adjacent countries |
| Churchill | Macmillan | Eden | in order of being PM of Britain |
| Newton Highlands | Waban | Eliot | green line stops |
| Sui | Song | Tang | chinese dynasties |
Taking the first letters of the filled in words and reading left-to-right, top-to-bottom, one gets LEGSFEET. The thing in the middle of LEGS and FEET is ANKLES which is the answer.