The building was trembling. This isn't unusual as there's a railroad running along side the building. But what was unusual was the lack of a train. Then a loud thud and finally silence. A few of us looked out the window.
[We might want to get Reba McEntire and Michael Gross on the phone in case this happens again.] [1]
There, in a freshly dug trench that didn't exist moments earlier, was a dead graboid [2]. It must have slammed into the foundation of I-95, which runs along the other side of the building.
[1] /boston/2018/09/11/tremors.jpg