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- There was some link between Isengard and Mordor, which I have not yet fathomed.3.11 — Book 3 Chapter 11 — The Palantir (11% in)
- His face was long, with a high forehead, he had deep darkling eyes, hard to fathom, though the look that they now bore was grave and benevolent, and a little weary.3.10 — Book 3 Chapter 10 — The Voice of Saruman (24% in)
- Thirty ells, or say, about eighteen fathom: that's no more than your guess at the height of the cliff.'4.1 — Book 4 Chapter 1 — The Taming of Smeagol (43% in)
- As they drew nearer they became aware that these were of vast size, very ancient it seemed, and still towering high, though their tops were gaunt and broken, as if tempest and lightning-blast had swept across them, but had failed to kill them or to shake their fathomless roots.4.7 — Book 4 Chapter 7 — Journey to the Cross-roads (87% in)
There are no more uses of "fathom" in The Two Towers.
Typical Usage (best examples)