I'm going to steal my family's book back. And if Raleigh gets in my way... it's on.
― Sly Cooper[src]
After creeping through a small cave, Sly stumbled upon a large gate blocking the path to Raleigh's hideout. To get past it, he had to make use of his climb move. Once on the other side, he stumbled upon some searchlights, which Bentley explained to be very dangerous, should Sly take one careless step. Sly snuck past the security and caught sight of a big blimp, which Bentley claimed to be where Raleigh's hideout. Sly, however, stated that it looked more like a machine than a hideout, to which Bentley agreed, stating that it was a storm machine responsible for the perpetual bad weather and all of the shipwrecks in the area.
Bentley then began to question Raleigh's need for the bad weather, which remained unknown to Sly. However, Sly was still determined, regardless of the harsh conditions, to press on and reclaim what was rightfully his. As he proceeded through the area, he fought through several more walrus guards protecting the entrance. He eventually reached the end, where he found a treasure key stashed inside a jewel case. He smashed the case and stole the key, using it to unlock the gate that led him to Raleigh's gigantic ship.
The clues have led me to believe that the code for this vault is 7-9-2.