Guys, you have to go up with the stairs located at the middle of the ship, not that stairs at the front of the ship.
At the middle floor, there is a centered little room with a stairs up! Use these!
First time, I used the stairs at the front of the ship (jumping on the ship’s roof) and i was not able to complete, then i jumped back down and used second stairs, then i did it. Try it too!
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