The key is hidden in the bookroom the book shelf. It is at the back of the book "Rokhopper and the stowaway". Use the key to get into rockhopper' ship.
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First go to the library, then read the brown book called ,"Rockhopper Treasure", (I think? But it is brown) and read (you dont have to just flick through the book) and at the end there will be a key. GOOD LUCK!!!
u need the key to get in (in rockhoppers journal at book room). it is under the migrator deck.
You Go to rockhopper's ship and then you go downstairs of the ship and there will be a room and it will let you in only if you have the key.
rockhoppers password is rockhopper
It is a door with a window inside the ship at the end with a key hole. You have to get the key though. Look on cheats to find where it is.
its in the book room where the books are in the back of rockhoppers diary hope i helped, my penguin name is mong2009