More big swells could be heading for Papua New Guinea's New Ireland province, which is still struggling to assess the damage caused by unusually high king tides that struck earlier this week.
Global warming, volcanic activity and a huge swell from Hawaii are just some of the explanations from New Ireland's locals for the huge seas this week.
The waves washed away costal village houses or shuddered them up to 50 metres inland.
Disaster officials say several thousand people could be effected.
Video: Storm Surge inundates islands in PGN (ABC News)