"The Tokyo Electric Power Corp. says Unit 1 at the Fukushima Daiichi nuclear power plant did, in fact, meltdown during the 2011 accident." ( source )

“No. 2 & 3 are also scheduled for imaging, and it is widely suspected they also suffered complete meltdown.” ( source )

Hard to believe that happened 4 years ago and they still have even figured out how to stop the radioactive water from spilling into the ocean, much less clean up the mess.