|Uncharted: Drake's Fortune Walkthrough|
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Unlocking the Past is the sixth chapter of Uncharted: Drake's Fortune.
Nathan Drake exits the under-chambers of the fortress and finds himself in a courtyard, at the base of a large tower. Noticing that the same tower has been drawn on the map that he recovered from the u-boat, he scales the tower's outer walls, and inside uncovers a set of keys that allow him to proceed further into the fortress. Inside, he finds an English helmet and swords, alongside a message that reads, "Fletcher, we have gone to the great tower. I pray that you will meet us there. -Francis Drake." The message is accompanied by a drawing of the tower, and a map leading to it.
Pushing further into the fortress, Nate arrives at and climbs the tower, which provides a vista of the Island below. He finds Francis Drake's telescope, and uses it to study a distant harbor, where he sees that the ships that brought Francis Drake to the island lie ruined and almost completely sunk in the water. It dawns on him that Francis Drake may never have made it off the island. He also notices Elena Fisher, who is standing near the base of the tower, filming the same sight across the harbor. Two of Eddy Raja's pirates, armed with an M79 grenade launcher, sneak up to a ledge behind her and prepare to kill her. Nate opens fire on them, and they turn and fire at him instead. The resulting blast destroys a portion of the tower and knocks Nate unconscious.
He is awoken in a jail cell by Elena, who is throwing stones in at him through the barred window. She informs him that it will just take a tug to pull the bars out, and disappears as Eddy Raja enters the jailhouse, carrying Nate's map. Eddy tells Nate that his men are dying, and that they "can't even go outside to take a piss without an armed guard." Nate refuses to cooperate with Raja's threats and demands, saying that he'd rather die than help him. While the two have been talking, Elena has placed a hook on the cell window bars, and attached the hook to a jeep using a cable. She uses the jeep to rip the back wall out of the cell, and as Eddy stares in shock, Nate grabs the map from his hands and escapes through the wall. He climbs into the jeep and the two drive into the jungle, pursued by Raja's men.
- This chapter gives the first hints that there is something else on the island as Eddy tells Drake his men are being killed off and cannot go anywhere alone for fear of being killed. Eddy also lets slip that he is working for someone though he does not say who.