Resurgence Island DG-56 Water Level Easter Egg

Here's how you collect the DG-56 redacted weapon print:
You enter one of these codes
53 33 30 8 2
76 67 9 8 6 1
49 47 11 4 3
95 24 8 7 4 2
22 17 13 5 1
55 24 8 7 4 2

into an access code keypad unlocking the DG-56 and a Foresight killstreak.
You start by collecting the ID from the Decon Zone and then opening a door on the second floor of the power plant (outside Chemical Engineering). You then run upstairs of Chemical Engineering to find two numbers that form the code.
Then you locate the third and final number outside the water level room. Then enter the side room and type into 3 different terminals and press buttons until the same 3 numbers are reached.