Earlier this year, remotely piloted robots transmitted what officials believe was a direct view of melted radioactive fuel inside Fukushima Daiichi Nuclear Power Plant's destroyed reactors - a major discovery, but one that took a long and painful six years to achieve. In the meantime, the program to clean up the destroyed reactors has seen numerous setbacks and concerns, including delays on Japanese electrical utility Tepco's timetable to begin removing the highly radioactive fuel and continued leakage of small amounts of radioactive substances.