Story highlights A robotic probe into the Fukushima nuclear plant released crucial information on conditions inside the reactor

TEPCO: Recorded radiation levels and temperatures are lower than expected

The robot was sent into the plant after the first one broke down

Tokyo (CNN) A second robotic probe sent into the crippled Fukushima nuclear plant has captured images of a strange green glow.

Tokyo Electric Power Company (TEPCO) deployed the second remote-controlled robot last week after the first one broke down

The robot detected lower radiation levels and temperature than expected, an indicator that cooling systems were working effectively, according to a statement released by TEPCO.

JUST WATCHED New look inside Fukushima Replay More Videos ... MUST WATCH New look inside Fukushima 01:08

"It is a great step forward towards the decommissioning work as we can earn necessary data for the next investigation," said Akira Ono, the chief of Fukushima Daiichi plant.

TEPCO said the yellow seen on the images seemed to suggest a discoloration of the grating, though the cause was unknown. It said the green glow could not be seen when filmed from other angles.

Read More