“We should think out of the box so we can examine the bottom of the core and how melted fuel debris spread out,” TEPCO Head of Decommissioning Naohiro Masuda said.

Despite the failed probe missions, officials have added that they want to stick to their schedule of starting the site clean up in 2021.

Decommissioning the site is expected to cost tens of billions of dollars and last around 40 years.

Fukushima’s No. 2 reactor was found in February to have a radiation level of 530 sieverts.

Exposure to four sieverts is enough to be lethal, according to the National Institute of Radiological Sciences.

South Korea’s low-cost carrier Jeju Air also announced on Tuesday that it would not use Fukushima Airport due to fears of radiation.

Some of its customers had reportedly posted online that they would not use the airline because they didn’t want to “board airplanes that flew over Fukushima.” http://mashable.com/2017/03/03/fukushima-robots-fail/#at3NoAFNikqn