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Emergency services - including fire crews, St John and a helicopter - responded to the incident at Admiralty Bay, after reports of a fire on a boat.
It is understood there may have been an explosion.
A St John spokesman said just before 9am paramedics were on the scene with a helicopter.
One person was being airlifted to Wellington Hospital.
However, their condition is not known at this stage, he said.
Police said there were four people on board when the incident happened and that they were notified of the situation about 8am.
"One person appears to have sustained burn injuries and they are being assisted by [a] helicopter," a statement said.