We use Distributed Acoustic Sensing (DAS) to turn a dark fiber in the MIT telecommunication network into a seismic antenna. The goal of the experiment is to understand the ability to record signals from a variety of sources including earthquakes and anthropogenic activities for a regular telecommunication dark fiber in the urban area. The cable connects building 24 and W92 with a total length of 1.2 mile. It passes the Massachusetts Ave, the Kresge construction site, the Briggs’s field, and along the Vassar Street. We collected 5 days of strain rate data along the cable. The DAS recorded local sources including construction operations, passing vehicles and trains. We use interferometry to obtain a signal at 2-4 Hz traveling at 230 m/s, potentially can be used to monitor subsurface temporal changes. We observe higher strain during teleseismic arrivals after stacking. However, local sources dominate the data which makes identifying earthquake arrivals at busy times difficult. We also conducted an active geophone survey on a portion of the fiber with hammer source. The wave velocities obtained from the geophone survey can be used as constraint for analyzing DAS data, which has vibration issues due to poor coupling if the target source is weak. We plan to use this data to calculate receiver functions, monitor subsurface changes, monitor traffic, and analyze DAS instrument response.