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“When we educate the public, they see what we’re doing with the plastic bags and the fishing line, you see the light bulb go on in their head,” Wall said.

The giant drill restarted around 8 a.m. on the south side of the disassembly vault at South Lake Union, after an overnight stoppage at the concrete head wall Monday evening.

Bertha should reach the head wall of the cubelike retrieval vault by Monday night, then stop.

In many hospitals, adjacent rooms are “mirrored” because they share a head wall, the one behind the bed with all the equipment and attachments in it.

Nor could the head wall, the one with all the equipment, be designed entirely from scratch.