Push the leftmost crate once, as indicated by the lower arrow in this screenshot. Climb on top of the crate you just moved and push the upper crate once.
The crates should now look like this.
Pull the left crate out again. Then climb over it and push it once, so it ends up in the position shown above.
Turn around and pull the other crate away from the stacked crates to reveal the door to the STERN. Take the flares on the ground and use the STERN KEY to unlock the door.
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