This is the view inside of the ceiling with the new wire pulled in through the hole in the laminated beam.

The existing dimmer switch box had the correct wiring (Hot and neutral) in it to facilitate the connection to another light fixture. A long thin screwdriver was inserted along side of the switch box to feel for any obstacles such as pipes or wood studs.

Close shot before the dimmers are mounted to the wall. All of the white neutral wires are spliced together and tucked into the back of the box first
This hole going up into the ceiling was made with a Milwaukee 0721-20 V28 28-Volt Lithium-Ion 1/2-Inch Cordless Right Angle Drill This view is the inside of the wall through the hole in the previous photo. The big hole in the wall was needed to accommodate the big angle drill and a long auger drill bit.