Mole Man of Technopolis left Technopolis and moved to below the Shield because Baron Stark did not appreciate his genius. He had spent his modifying and using Ultron Sentinel's to build his underground kingdom there. This was discovered by two Hel-Rangers, Iron Fist and Punisher. It was then that the Ultrons went rogue and started to attack them, but they were able to destroy them all. The Punisher allowed the Mole Man to go back to his kingdom.