On Jan. 11, a small explosion in Usdan University Center's mechanical room left several staff and students trapped inside with possible injuries. "We've got a situation," says Bill Nelligan, director of environmental health, safety and sustainability. "Please gather your gear and head to the basement." A group of six Wesleyan staff members, trained in light search and rescue techniques, quickly prepare for the task. They sport reflective vests, safety helmets, goggles and gloves, and carry a backpack equipped with flashlights, duct tape, first-aid kits, tools and blankets. Team leader Allen Alonzo, associate director of information technology auxiliary services, breaks the…