Divers were searching for five workers after an undersea tunnel collapsed at one of Japan's biggest oil refineries Tuesday, emergency services said.
Six people were in the partially constructed tunnel at Kurashiki, 550 kilometres (350 miles) west of Tokyo, when it caved in, but one managed to get out, a spokesman for the city fire department said.
The survivor "said that sea water came gushing in" and flooded the tunnel, according to the spokesman.
The accident happened at Mizushima Refinery, operated by JX Nippon Oil and Energy Corp.
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