From the Alexandria Gazette, April 18, 1837
The Thames Tunnel.—At the late annual meeting of the proprietors of the Thames Tunnel, to receive the report, and make choice.of directors, a report was read which gave much satisfaction. During, the last half year. £20,000 had been received from the government and £22,000 had been expended for the works and salaries; Since the last report the work had been advanced a farther distance of 65 feet, under the deepest part of the river, making the present length of the tunnel 725 feet 3 inches – Boston Daily Advertiser.
Source: Alexandria gazette. [volume] (Alexandria, D.C.), 18 April 1837. Chronicling America: Historic American Newspapers. Lib. of Congress. <https://chroniclingamerica.loc.gov/lccn/sn85025007/1837-04-18/ed-1/seq-2/>