Below the concrete sidewalks and pathways between MIT Buildings 66 and E17 lies a labyrinth of tunnels and The Borderline Mural Project, a 200-foot-long installment of more than 60 murals painted by MIT-affiliated artists. What once was one of MIT’s busiest underground corridors and destinations is now quietly abandoned in the wake of the Covid-19 pandemic. Inspired by the Corona Maison art project, MIT students from The Borderline club developed a virtual tunnel called Tunnel66 to reconnect the MIT community through a collaborative digital art project. “Since we can’t be…