Larian Studios Forums Divinity: Original Sin 2 Divinity - Original Sin 2 - Help/Tips/Tricks Code for the hatch in the barracks (Arx, spoilers)

You'll see a message after each seperate choice whether it was correct.
So if the first would be 3(can't recall what it was 3-1-2-4, 3-1-4-2, 1-3-2-4, or 1-3-4-2 i think). You'd get a message that you hear a click or get a message that it was the correct choice. If you don't get that message when choosing it means it was the wrong one.