A worker involved in the battle to regain control of the Fukushima No. 1 nuclear plant's stricken reactors has questioned the safety precautions for workers taken by Tokyo Electric Power Co.

The man, who was hired by a sub-subcontractor of plant operator Tepco, cited the lack of supervision of radiation monitoring when two workers were injured and a third exposed March 24 after wading into highly contaminated water.

"We don't normally work in water," said the man, who was tasked with laying cables to restore power at the No. 2 reactor and wished to remain anonymous.