Two young men are ''extremely lucky'' to escape serious injury after their boat hit rocks at night near Russell.
The pair, from the Kawakawa area, were returning from a game fishing trip about 7.30pm on Thursday when they took a route between rocks at Tapeka Pt.
The ''very experienced'' boaties had used the passage before and it was marked on their GPS plotter, so it was not clear why they had hit rocks, Russell police Constable Mike Gorrie said.
Moments later the boat was swamped by a wave which filled it, dragged it back into the water and capsized it.
With their phones and emergency beacon in the upturned boat, they decided their only option was to swim for shore.