All 4 Uses

although
in
The Hunt for Red October
(Auto-generated)

Although outwardly he was the model Soviet child, inwardly he wondered why what he learned from his father and in school conflicted with the other lessons of his youth.†
Chpt 3.

although = even though -- used to connect contrasting ideas
Although this quiet, tomblike facility had never been shown to the public, and though it had none of the drama associated with military life, the men on duty here were among the most important in the service of their country.†
Chpt 4.
Although the 688-class submarines were faster than the older Victors, the Russian submarine had simply not slowed down—for fifteen hours, it was later determined.†
Chpt 5.
That is a Lithuanian name, although we believe his internal passport designates his nationality as Great Russian.†
Chpt 6. *

Definitions:

(1) (although)
even though -- used to introduce an idea that contrasts with or makes the main statement surprising

At the start of a sentence, although can play a role similar to words like however, yet, still, even so, on the other hand, or nonetheless—all of which signal contrast. In the middle of a sentence, although can sometimes be used where but or though might also work, but though or but often sound more natural. For example, "She's a great teacher, though not the most popular" is usually smoother than "She's a great teacher, although not the most popular."
(2) (meaning too rare to warrant focus)