Big Bertha Seattle


VIDEO: Big Bertha breaks through: tunnel-boring machine enters repair pit, ready for disassembly
Drilling delays a problem for tunnel-boring machine Big Bertha even as she slumbers below ground
Repairs to Big Bertha will include 86 tons of steel reinforcement to tunnel-boring machine's bearing, cutter drive
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Before Bertha repairs begin, archaeologists will test soil for artifacts
Tunnel-boring machine Big Bertha shut down for "months" due to complexity of needed repairs
Another mystery overheats, halts tunnel-boring machine Big Bertha once more
Big Bertha, world's largest tunnel-boring machine, arrives in Seattle