After drilling four shafts and sending in one man to look, engineers still don’t know what is blocking the giant tunnel drill Bertha in Seattle.
After drilling four shafts and sending in one man to look, engineers still don’t know what is blocking the giant tunnel drill Bertha in Seattle.
The next step, not simple, is to send workers to inspect the drill face itself.
After drilling four shafts and sending in one man to look, engineers still don’t know what is blocking the giant tunnel drill Bertha in Seattle.
The next step, not simple, is to send workers to inspect the drill face itself.