TEPCO released photos of two manhole covers in the Torus room of Fukushima Daiichi Reactor 2.
The robot was sent to inspect the catwalk near the inspection manholes attempting to locate any signs of damage and collect radiation readings.
The highest levels registered by the robot on the investigation on the 18th, was 120 millisierverts per hour. This is still significantly high radiation levels which would prevent many operations from being carried out by humans in the near-term.
The investigation did not yield any further answers as to where the water being poured into the crippled reactor is going.