... its line, one of which was 552 feet deep; and it was completed at a cost of nearly $4,000,000. The main tunnel is 1,650 feet from the surface, 20,000 feet long, 12 feet wide, and 10 feet high. Mr. Sutro sold his interest in the tunnel and went to San Francisco, where he invested in real estate, and became one of the richest men on the Pacific coast. He was elected mayor of San Francisco in 1894. ...