The Fukushima Daiichi nuclear power plant’s radiation levels have significantly dropped since the cataclysmic meltdown 14 years ago Tuesday. Workers walk around in many areas wearing only surgical masks and regular clothes.

It’s a different story for those who enter the reactor buildings, including the three damaged in the 2011 earthquake and tsunami. They must use maximum protection — full facemasks with filters, multi-layered gloves and socks, shoe covers, hooded hazmat coveralls and a waterproof jacket, and a helmet.

A remote-controlled extendable robot with a tong had several mishaps including equipment failures before returning in November with a tiny piece of melted fuel from inside the damaged No. 2 reactor.

That first successful test run is a crucial step in what will be a daunting, decades-long decommissioning that must deal with at least 880 tons of melted nuclear fuel that has mixed with broken parts of internal structures and other debris inside the three ruined reactors.