It’s been an uphill battle for the coastal prefecture of Fukushima, Japan, since an earthquake and tsunami devastated the region in 2011, causing a nuclear disaster at its power plant. Six years later, workers are still battling to decommission the plant, where radiation is deadly. Officials expect the cleaning won’t be finished for decades.

“This is an accident that does not exist in the past tense, but in the present progressive form,” Fukushima Gov. Masao Uchibori said earlier in March, criticizing Japanese Prime Minister Shinzo Abe for not explicitly the disaster in his annual speech. “It’s not possible to avoid using the important and significant terms of the nuclear plant accident of nuclear power disaster.”

Read: Everything To Know About The Fukushima Nuclear Disaster

The most recent robots and cameras deployed inside a reactor containment vessel in the Fukushima Daiichi power plant recorded extremely high levels of radiation, the Japan Times reported Tuesday. Tokyo Electric Power Company, tasked with decommissioning the plant, has been using robots to find and clean the melted nuclear fuel debris that is believed to be causing the exorbitant levels of radiation.

The company had to pull some of its robots out in February, after radiation reached such high levels that not even machinery could function correctly. Measurements at the time showed levels of 650 Sieverts per hour, according to the Japan Times. A single Sievert, in contrast, could cause radiation sickness in a human, while exposure to 10 Sieverts would likely prove fatal.

Meanwhile, hundreds of wild boars invaded the surrounding areas after it was left uninhabited when residents in the region were evacuated after the disaster. Hunters have been hired in an attempt to exterminate the animals.

Read: Fukushima's Radiation So Destructive, Not Even Robots Can Survive

The magnitude-9 earthquake and subsequent tsunami that struck in March 2011 caused the evacuation of 160,000 residents and the implementation of a 310 square mile uninhabitable zone. The quake was the worst to ever hit Japan and as a result, caused the worst nuclear disaster the world had seen since Ukraine’s Chernobyl meltdown in 1986. Three of the reactors at the Fukushima Daiichi power plant melted down when the tsunami caused a blackout at the plant that shut off its cooling systems.

Despite the ongoing decommissioning, increasingly high levels of radiation and wild boar problem, officials have begun welcoming some evacuated people back to their homes. It’s unclear how many residents will choose to return.

GettyImages-633512856 In this handout provided by TEPCO, the deformed grating vessel of Fukushima's No. 2 reactor is shown Jan. 30, 2017. Photo: Getty Images

GettyImages-450358277 Workers remove nuclear fuel rods from a pool inside the No. 4 reactor at the Fukushima nuclear plant in Japan, Nov. 18, 2013. Photo: Getty Images

GettyImages-514293754 A TEPCO employee looks at the destroyed reactor in Fukushima, Japan, Feb. 25, 2016. Photo: Getty Images

GettyImages-513974084 Personal items were left behind in Fukushima, Japan, Feb. 26, 2016. Photo: Getty Images

RTS121Z6 A wild boar roams in barren, Fukushima, Japan, Mar. 1, 2017. Photo: Reuters

GettyImages-514294196 The damaged No. 3 reactor at Fukushima Daiichi plant in Japan is shown Feb. 25, 2016. Photo: Getty Images

GettyImages-513974028 A deserted home is shown in Fukushima, Japan, Mar. 11, 2016. Photo: Getty Images

GettyImages-514294220 Workers stand near the deserted nuclear power plant in Fukushima, Japan, Feb. 25, 2016. Photo: Getty Images

GettyImages-513973906 The barren landscape of Fukushima, Japan sits empty, Mar. 11, 2016. Photo: Getty Images