It shouldn't be a big deal for you, but not for the two other diggers. This job is not without its hazards, and the first you'll encounter are a few Mirelurks.
Talk to Bobbi about helping two other hires with an underground dig job. When you reach the correct door, a Ghoulish woman by the name of Bobbi No-Nose will offer you work. Once in town, follow the path on the left and look for a narrow alley on your right (if you reach The Memory Den, you've gone too far). To begin this quest, head to Goodneighbor at the east side of Greater Boston.