The contractor that cut into a 4-inch pipe carrying natural gas underneath downtown Sun Prairie on July 10 just before an explosion leveled a city block and killed a firefighter was not registered to do business in Wisconsin, according to state records. The Journal Sentinel confirmed Thursday that Michigan-based VC Tech, Inc. was hired by Kansas-based Bear Communications to help install new fiber optic cable lines in the Madison suburb of 30,000. The job was supposed to deploy a drilling process known as directional boring, which lays new cable lines underground without digging trenches, according to a city work permit obtained by Bear Communications.