Uncharted: Drake's Demise by auguy87, I think. The title is right, I own the fucking game and the first bit of the story is pretty much spot on.
Perhaps, you should have read this:
Sir Francis Drake: legendary explorer, captain, and privateer. Though the most successful sailor of his day, he still manages to stumble onto the treasure hunt of a lifetime in the twilight of his life, leading to a race against his Spanish rival for a potentially world-altering find.
Greetings, readers. This story is set in the universe of the Uncharted video game series. Though it does not feature the characters of those games, it does tell of the events leading up to the first game, Uncharted: Drake's Fortune.
Sounds like the Uncharted video game world is built around pseudo historical events involving a real historical figure, and much of it predicated in real myths and legends.
Given this, it's somewhat unlikely that anything he may have in fact copied is copyrightable anyway as much of it doesn't originate with the game developers and is old enough to be public domain.
Even if he has straight up copied any elements of the game that are subject to copyright protection, as I said above, the video game companies love fan fiction.
Even if there is a technical violation, they are highly unlikely to pursue it unless he tries to actually sell the story.
The same can not be said for song lyrics and the music industry.
One music artist actually sued another for copying x seconds of silence.
The courts ultimately ruled that the silence wasn't a protected element, but the lawsuit cost both artists a lot of money.