Telstra/NBN cables are a nightmare. I tried the “dial before you dig” thing before installing a line for high pressure water in case of fire and they were about as specific as asking where the moon is and someone pointing up at the sky.
Turns out mine runs down beside my drive on the far side of a garden bed in a giant arc before coming around the back of the garage and up to the main bedroom. Not a straight line anywhere and the regs about minimum depth largely ignored.
