ANOTHER large eruption hits Tonga volcano as fears grow for British charity worker, 50, who was swept away by Sunday's tsunami and hasn't been seen since - as NZ sends flight to assess damage in the remote island chain hit by 'once-a-millennium' blast.
- The 'violent' underwater volcanic eruption was labelled by scientists as a 'once in a thousand years explosion'
- It hit the Pacific at 5.10pm local time, and was so huge the explosion was visible from outer space
- Around 20 minutes later, Tonga was hit with waves which overwhelmed homes, buildings, fences and roads
- Dramatic video from Tonga showed huge waves crashing into homes and buildings, flooding the island
- Satellite images showed a huge three-mile-wide plume of ash and steam rising into the air to about 12 miles
