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AT least seven people have died and two remain missing after a South Korean-flagged chemical tanker capsized off the coast of Japan.

The vessel, carrying almost 1,000 tonnes of acid, overturned during a storm prompting an urgent rescue operation involving a helicopter.

A South Korean tanker is seen capsized off Mutsure Island, Yamaguchi prefecture, southwestern Japan Wednesday, March 20, 2024. The coast guard said it received a distress call from the Keoyoung Sun chemical tanker, saying that it was tilting and was taking refuge near the Island. (Kyodo News via AP)
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The South Korean chemical tanker capsized off the coast of Japan - killing at least seven
A rescue operation is conducted as a South Korean tanker capsized off Shimonoseki, Yamaguchi prefecture, southwestern Japan Wednesday, March 20, 2024. The coast guard said it received a distress call from the Keoyoung Sun chemical tanker, saying that it was tilting while taking refuge near Japan's Mutsure Island due to rough weather. (Kyodo News via AP)
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Rescue workers haul a crew member up from the choppy waters
A Japanese coast guard patrol vessel, bottom, conducts a search operation near a South Korean tanker which capsized off Mutsure Island, Yamaguchi prefecture, southwestern Japan Wednesday, March 20, 2024. The coast guard said it received a distress call from the Keoyoung Sun chemical tanker, saying that it was tilting and was taking refuge near the Island. (Kyodo News via AP)
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Japanese coastguard ship approaches the struggling tanker

Japanese coastguard rushed to help the crew of 11, but only nine have been found so far.

Rescue workers are still searching for two more who were onboard when disaster struck at 7am on Wednesday local time (10pm GMT on Tuesday).

The condition of the two survivors remains unknown.

Crew onboard the Keoyoung Sun sent out a distress call as the tanker struggled off the coast of Japan’s Mutsure Island.

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They were sheltering from bad weather when the tanker started to tilt.

Waves were as high as 3.5 metres during the storm, swallowing the boat.

Dramatic footage from shows the boat being thrown around in choppy waters and a rescue helicopter hovering above hauling a member of the crew up to safety.

The crew included two South Korean, one Chinese and eight Indonesian workers.

The boat was anchored off the coast of Mutsure Island, near Honshu at the time.

Honshu, Japan's main island, is about 1,000km from Tokyo.

Officials said the tanker was carrying 980 tons of acrylic acid.

No leak has been detected yet but environmental protections could be put in place if any acrylic acid did leak from the tanker.

The chemical is used in plastics, resin and coatings and can irritate human skin and eyes according to the U.S. Environmental Protection Agency.

(TAKEN WITHOUT PERMISSION)<br />
KEOYOUNG SUN Chemical / oil tanker<br />
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Keoyoung Sun, a South Korean-flagged chemical tanker, is capsized off the coast of Yamaguchi prefecture in western Japan, March 20, 2024, in this photo taken by Kyodo. Mandatory credit Kyodo via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. MANDATORY CREDIT. JAPAN OUT. NO COMMERCIAL OR EDITORIAL SALES IN JAPAN
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There are still two crew members missing
NHK footage shows the rescue helicopter in action
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NHK footage shows the rescue helicopter in action
Keoyoung Sun, a South Korean-flagged chemical tanker, is capsized off the coast of Yamaguchi prefecture in western Japan, March 20, 2024, in this photo taken by Kyodo. Mandatory credit Kyodo via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. MANDATORY CREDIT. JAPAN OUT. NO COMMERCIAL OR EDITORIAL SALES IN JAPAN
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The tanker was anchored when it got into trouble