Police and emergency services in Pangai, Ha’apai were at the scene to pull out a car from the sea at Foa causeway while a man was rushed to hospital with serious injuries.
The injured man will be transfderred to Tongatapu by plane for treatment, local media reported.
Kaniva News understands the car was hit by waves while it attempted to cross over to the other side of the causeway.
Ha’apai islands were still on tropical Cyclone Victor’s alert and since the begining of this week motorists were seen waiting in queues at ends of the islands as huge waves overtopping the causeway.
Police could not immediately be reached for comments.