Looks like a fair amount of work there. Maybe not the best way to protect the cord, at least he was thinkin.
For some people, thinking can be dangerous.
Heck, we use hose conduit frequently. Really, but we don't stick SO cord in it.
Special application, and a special kind of hose used to enclose signal and communication wires in a trainway (running accross the rail ties, under the rails, etc).
Radar
I agree Radar. I didn't know it until I came to Nevada, but there actually exist rubber "hoses" manufactured to serve specifically as "conduit" in mines.
As mines are not subject to the NEC, these hoses have "MSHA" approval, rather than a UL tag.
Hey.. think of it as Extra Extra Hard Service cable..
I've had events where we used every section of Yellow Jacket (cable ramps) that we had, and placed barricades to protect the rest of the cable run.. what did the drivers do? They stopped, and started to move the barricades so they could drive over the unprotected cable (actually multi-pair audio snake) before I stopped them, and read them the riot act. Sometimes you just can't win..