Field Trip Lighting
BakPak Lights from Lunar Lighting.
Lighting Balloon by CPP.
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Ugly Nuggets
Microtunneling and Directional Drilling
Microtunneling Diagram.
Microtunneling Boring Machine.
Horizontal Drilling Diagram.
Directional Drilling Machine.
Directional Drilling Machine.
More information at the Australian Society for Trenchless Technology.
Cast Rabbit Holes
from Swedish design group Front – more at Designboom.
Fulgurites
Fulgurites are formed by lightning strikes. Heat from the strike melts silica in the ground and fuses it into hollow tubes – more at wikipedia.