Uploaded 27-Oct-13
Taken 21-Jun-13
Visitors 135


98 of 217 photos
Photo Info

Dimensions1623 x 1490
Original file size1.65 MB
Image typeJPEG
Color spaceUnknown
Date taken21-Jun-13 18:38
Date modified27-Oct-13 15:35
Shooting Conditions

Camera makeNIKON CORPORATION
Camera modelNIKON D40
Focal length26 mm
Focal length (35mm)39 mm
Max lens aperturef/4
Exposure1/8 at f/8
FlashNot fired
Exposure bias+1/3 EV
Exposure modeAuto
Exposure prog.Aperture priority
ISO speedISO 1600
Metering modePattern
Digital zoom1x
Tunnel crew at mainline north portal

Tunnel crew at mainline north portal

My house is a bit older and uses block with three internal hollows (as opposed to the more common two hollows). It's also a true 8 inches thick; modern CMU is a bit thinner. As a result, there are more internal webs to cut through.

The lower (staging) track comes almost straight through the wall, and cuts through one web. The upper tunnel, because of it's lower approach angle on the north side of the wall ended up requiring a cut through three internal webs.