The internet and phone lines have been down since the eruption, leaving the 105,000 residents on the islands virtually uncontactable.
Sky News science and technology editor Tom Clarke explains what we know so far about the underwater volcano eruption near Tonga.
Follow us on Twitter: https://twitter.com/skynews
Like us on Facebook: https://www.facebook.com/skynews
Follow us on Instagram: https://www.instagram.com/skynews
For more content go to http://news.sky.com and download our apps:
Apple: https://itunes.apple.com/gb/app/sky-news/id316391924?mt=8
Android https://play.google.com/store/apps/details?id=com.bskyb.skynews.android&hl=en_GB
Sky News videos are now available in Spanish here/Los video de Sky News están disponibles en español aquí https://www.youtube.com/channel/skynewsespanol
To enquire about licensing Sky News content, contact clipsales@sky.uk