Kelly O’Connell, E’16, came to college with interests in environmental issues and climate change. Today she credits Northeastern’s co-op program, backed by rigorous engineering courses, with guiding her toward her career goals.
Boston’s Big Dig — the most costly highway project in United States history — has been plagued with problems since ground was broken in 1991. Last week, inspectors discovered a sinkhole beneath the surface of the I-90 connector tunnel, possibly caused by a ground-freezing process used during construction. We asked Thomas Sheahan, a professor of civil and environmental engineering at Northeastern University, to explain why the ground-freezing process was used and whether it caused the sinkhole to form.