All 3 Uses of

Titans
in
The Count of Monte Cristo

Dantes redoubled his efforts; he seemed like one of the ancient Titans, who uprooted the mountains to hurl against the father of the gods.†
Chpt 23-24 *

Until then he had been sustained by rage, by his strength of mind, by despair, by the supreme agony which led the Titans to scale the heavens, and Ajax to defy the gods.†
Chpt 111-112

Whole days have I passed in these Titanic efforts, considering my labor well repaid if, by night-time I had contrived to carry away a square inch of this hard-bound cement, changed by ages into a substance unyielding as the stones themselves; then to conceal the mass of earth and rubbish I dug up, I was compelled to break through a staircase, and throw the fruits of my labor into the hollow part of it; but the well is now so completely choked up, that I scarcely think it would be possible to add another handful of dust without leading to discovery.†
Chpt 15-16 *

Definitions:

(1) (Titans as in: Atlas from Greek mythology)
Greek mythology: the giant-sized gods who ruled the Earth until overthrown by Zeus

Atlas (often seen holding the earth) is perhaps the best known Titan. The Titans were offspring of Uranus (Heaven) and Gaea (Earth).
(2) (Titanic as in: sinking of the Titanic)
large British passenger ship that hit an iceberg and sank -- killing about 1500 people in 1912
(3) (titan as in: titan of industry)
someone who is powerful or large
(4) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

Saturn's largest moon is named "Titan" because of its size.