This is the first step in the 40-year goal to make the area safe
The radiation inside the plant is at lower levels than previously expected, which is a really good sign. This means that wireless devices could soon be used to explore the radioactive site. The levels are still too high for a manned mission. The radiation measured could kill a person within one hour of exposure.
The robot got stuck after a while and unfortunately had to be abandoned there. Another amphibious robot will be sent next year for a similar mission.