On February 3, 2017, at approximately 5:57 p.m. an employee was working in the crawl space of Tower B to unclog food sink drains underneath the facility’s kitchen. Workers were working in a confined space in Mechanical Room Number 5. They were tasked to unclog four food drains, which were located 50 to 60 feet from the confined space entrance. The employee exited the confined space before the two additional coworkers who were still working in the confined space. The employee sat on a bucket after exiting the confined space and began having trouble breathing and collapsed.