Please tell me how to get the hammer in the cave with the japanese flag... ?
  
 
  
  
    The hammer is in the ship I believe.
   **Spoiler**
 You must first fix the torpedo with the arming device from the deck of the ship. It makes a hole in the ship. There are some doors under water inside the ship. In one of them is the hammer. Look for a box containing a rusty hammer. Good Luck... 
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