I'm going to steal my family's book back, and if Raleigh gets in my way... it's on.
― Sly Cooper[src]
After passing through a small cave, Sly stumbled upon a large gate blocking the path to Raleigh's hideout. He made use of his climb move on a nearby ladder to get to the other side. Once there, he was halted by moving spotlights. Bentley warned him that these lights would become dangerous if he was to take one careless step.
After sneaking past the security, Sly caught sight of a big blimp, which Bentley concluded to be Raleigh's hideout. Sly noted that it looked more like a machine than a hideout, which Bentley agreed with, correctly identifying it as a storm machine. It was the source behind the perpetual bad weather and shipwrecks in the area. Regardless of the unpleasant weather, Sly was still determined to reclaim what was rightfully his. He continued venturing across the island until reaching the end, where he found the first treasure key that would unlock the gate to Raleigh's lair.
The clues have led me to believe that the code for this vault is 7-9-2.