A pulsating mass of nearly 3 million devote Catholics in Manila moves in procession along a 6-kilometer route to reach their religious icon. In the crowd, hundreds of dehydrated and exhausted worshippers collapse, others suffer injuries, or enter a state of panic in reaction to the tight space. The world's largest religious gathering takes place in Allahabad, India where 100 million devotees converge in this one city. In this episode, we ride along with the emergency response team tasked with administering critical care to those hurt in the crowds.