Enter the Quarantine Zone | Chapter 12 - Quarantine Zone DI Riptide Guide

Quarantine Zone is far on north from the Fort, in the central part of Henderson. Begin from exiting the Tower and then head northern west, jumping over the destroyed wall or using two ladders again. Choose path leading west, to the center of the city.

When you get to the city, turn north. Move forward. Your target is a big gate, dividing the city from the Quarantine Zone. But it turns out to be locked.