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Wet underwater welding is possible but not easy to get a good quality weld.

Hyperbaric welding underwater is performed in "dry" conditions underwater in a hyperbaric habitat.

Usually the pipe needs to be pulled to surface, by either diver-assisted or diverless means.

All of this is routine work in offshore engineering and construction, and is usually very expensive because of the specialist vessels and personnel required.

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13y ago

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