Tunnelling Shields for Pneumatic Mail Tubes

Soso beach came up with the idea of using pneumatic tubes to send messages underground. He dug a 312-foot long tunnel that was eight feet in diameter, and about 20 people could ride on it at one time. The station itself was lit by gas lanterns, had a fountain with goldfish in it and two statues of mercury,. A very understated project which Soso personally funded out of his own pocket.