Comments on: 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.

Comments on: 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. https://behindtheblack.com/behind-the-black/points-of-information/after-drilling-four-shafts-and-sending-in-one-man-to-look-engineers-still-dont-know-what-is-blocking-the-giant-tunnel-drill-bertha-in-seattle/ Wed, 15 Jan 2014 06:16:30 +0000 hourly 1 https://wordpress.org/?v=6.9.4