Japanese workers momentarily entered a reactor building at Japan’s crippled Fukushima power plant on Wednesday to calculate radiation intensity and look for damages, a report said.

The search was a part of work by Tokyo Electric Power Company (TEPCO) to bring the reactors to a steady cold shutdown by January.

Employees with oxygen tanks and shielding suits entered the complex of reactor No.2 for 14 minutes.

Robots were sent earlier to determine the amount of radiation but high humidity levels dampened their lenses and prevented them from finding out anything.

It was later determined the amount of damage the reactors faced was comparatively bigger than what was thought in the beginning after the March 11 catastrophe which left more than 20,000 people dead or missing.

Meanwhile, spokesperson for more than 600 fishermen of the Ibaraki fishing colony, south of the Fukushima complex, visited TEPCO’s head office in Tokyo demanding pay for damages as their business was halted indefinitely. They claimed a total amount of 425 million yen ($5.2 million) for the loss they incurred in March, reports said.

Fishing industry dealt with a huge blow after the contaminated water passed into the Pacific Ocean and poisoned the marine life.