The repair effort continued overnight, and around 5:30 a.m. Tuesday, crews appeared to begin filling the massive hole around Northampton and Tremont streets that was left behind after the road buckled. A detail officer told NBC10 Boston at the scene that they are going to be in the area until at least 7:30 am. According to a Boston Water and Sewer Commission official, the 20-inch water break began around 3:45 a.m. of Monday. This is a pipe in question from 1872 that was restored in the 1970s. On Monday morning, water gushed from the broken water main, flooding a large road. A Subaru ended up being swallowed up in the resulting sinkhole, and some apartments even had some flooding in the area. The broken pipe dates back to the 1870s, according to city officials, and was repaired in the 1970s. The ordeal caused shockwaves early Monday morning. “I’ve never experienced a flood in my apartment, so it was scary and I was kind of confused because I just woke up and saw everything in the water,” Stephany Perez said. By about 4:30 a.m., the water had stopped, but parts of the road had begun to buckle. This is the third water main outage in the past four days, according to city officials. Once the hole is filled, crews will proceed with paving it.