Department of Homeland Security investigators conduct simulated chemical attack on Boston’s subway system. The team is investigating how chemical or biological contaminants released into the air would travel through the subway system’s underground tunnel network. Data will be shared with first responders who can use them in devising evacuation plans for riders, as well as to adjust ventilation, and modify train movements after an attack or accidental release. The MBTA Transit Police fine tune evacuation plans to protect the subway’s more than 1.3 million daily riders.”]
Source: https://www.csoonline.com/article/2126044/images-from-a-homeland-security-experiment.html