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You've got the map Sly. Select it as a power-up and read it's clues to find the treasure. I believe the first clue is... stand before the statue's gaze, to begin your walk along the treasure's maze.
— Bentley to Sly after arriving on Dagger Island[src]
Use the treasure map to find and unearth the deep sea diving equipment of Dimitri's grandfather, Reme Lousteau.
Go to the job and Bentley starts telling Sly about what to do. Sly says stealing a pirate boat is every thief's dream and it is a rite of passage. Sly is very enthusiastic about this job. As Sly, paraglide over to the jollyboat and control will switch to Murray. Row the boat to the ship and avoid the mines in the water. Sly climbs aboard and takes out three guards, two flashlight guards and one dog with two swords. After that, Murray rows everyone to the ship and Sly, Bentley, and Murray talk about setting sail and Skull Keep's cannons. Control switches to Sly and the ship. You can move around as Sly, but to steer the ship, use to steer left and to steer right. Steer the boat to the mouth of the harbor. Once out, the controls are still the same. Click R3 (), , , or to open the map. There is a red "X" on Dagger Island, so head over to the beach. Once you get there, a battle begins. Press near a cannon to fire it. Once the mast is down, you can either choose to sink it with another cannon being fired or you can jump onto the ship and get treasure by beating the captain. After that, you are on the beach and control switches to Sly. Access the map by pressing . To find the diving gear, use the clues to get to the beach with rocks spelling "SOS". The whole Cooper Gang goes to see Dimitri open the chest. LeFwee and his crew come to your location and capture Penelope.