A Ukrainian diver has been hauled into court in Poland over claims that he took part in the devastating undersea bomb attack on the Nord Stream gas pipeline.

The man, identified only as Volodymyr Z, was arrested in Poland on Tuesday and has been remanded in custody for at least a week.

'He is detained for seven days, and it is difficult to agree with this decision,' his lawyer Tymoteusz Paprocki said.

No one has ever taken responsibility for explosions that severely damaged pipelines carrying gas from Russia to Europe in September 2022, marking a major escalation in the Ukraine conflict and ramping up an energy supply crisis on the continent.

The suspect, a trained diver, has been living in Poland for three-and-a-half years and has a valid Polish residence card.