Get them all to unlock the Great Owl trophy/achievement.
Go to the destroyed house and stop the boat at the red banner.
Keep moving up the building until you reach the room with boards below you.
Jump on them and move on.
Go a little further and you will find the stash with gear upgrade and other items.
Go to the place where you have to find the Captain.
Find the red door at the bottom of the building.
The third stash is in the same building.
You must destroy the jars on the cabinet -they will reveal another stash.
When you are attacked by an enemy sniper, enter the building next to the boat.
Inside, you will find a white skull painted on the wall.
Go under the desk to another room and pick up valuable items.
The fifth stash is in the Captain’s apartment.
you oughta go down - find the white skull in one of the rooms.
It marks the location of another stash.
Kick the cabinet and move on -you will get a box and a helmet upgrade.
Look at the map - the stash is located right in the building in front of you.
The room with the skull has a table - crawl under it to the other side.
Inside you will find upgrades and another stash.
Look at the map again and go to the nearest building.
You will find three switches.
Counting from the left, activate them in this order - 3, 1, and 2.
You will launch the door to the next stash.
Lift the canister off the ground.
Then go to the generator and pour the fuel.
This will raise the chest from the water.
You reveal the entrance to the sewers.

Go through the hatch to the other side and you will get to the last stash in the game.
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