THE NEW CRYING WOMAN / TRAPPED PRISONER EASTER EGG ON IX HAS BEEN SOLVED!!

IT OPENS A SECRET WALL ON THE MAP????

This Black Ops 4 Zombies IX Easter Egg Guide is only possible thanks to:
u/za0820 for primary solve and explanation post
u/SavageXanchez , u/Monoxideducks u/Tooshkit and u/coldstone_the_gamer for further assistance!