2017-18 Photos--The tunnel escape raise project

The "escape raises" otherwise known as emergency exits, originally were smallish vertical shafts housing wood ladders to the surface. But like the tunnels themselves, these also deformed and compressed over time, and also (at least for the ones close to the rodwell and sewer) filled up with frozen rime. So this part of the project was to create newer bigger better ones. Four are planned in all, but so far only one has been completed--close to the new rodwell which is at the far end of the main tunnel (original construction map and description).

gantry structure
A key piece of this project is this gantry structure which was constructed in 2016-17 (and I'm thinking that the structure to its left will eventually become the roof over the opening) (SH).
the shaft and snow cage
The excavation was another project involving chain saws and shovels. The finished rectangular opening was to be 10 x 7 feet (SH).
digging out the escape raise
Another view. The red cage is for removing and dumping the snow (SH)...
dumping the snow blocks
...thus (SH).
the nearly completed shaft
Looking down the nearly completed shaft (SS).
the permanent ladder

Almost finished...here is the bottom of the permanent ladder (CH).

Credits and thanks so far: Sayer Houseal (SH), Sheryl Seagraves (SS), and Chris Hawkins (CH).

Next...over in the dark sector, a major expansion of the ARA project was underway.

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