We Finally Found What’s Blocking The World’s Largest Tunneling Machine
Ever since the colossal machine tunneling under Seattle, nicknamed Bertha, was stopped in its tracks, there’s been a frenzied speculation about what mysterious “object” could possibly block such a powerful machine. The answer is, at least partially, asteel pipe. The pipe was the well casing for a 2002 groundwater study, preceding tunnel construction. While Bertha…
