ABC News’ Diane Sawyer interviewed Nemcova in the months after the tragedy. Now, 20 years after one of the deadliest natural disasters in modern history, Petra sat down with Sawyer again to reflect on the horrors of that day, and the kindness of strangers that got her out alive.

Model Petra Nemcova opens up on 'GMA' about surviving the 2004 tsunami that killed 5,000 in Thailand. 'It's always difficult to go back in that moment.'

Nemcova speaks with ABC News’ Diane Sawyer about her life today after surviving a deadly tsunami in 2004. I Know I Shouldn't Laugh But These 60 Extremely Dumb Things People Posted On The Internet This

Banlue Choosin has been monitoring the seas around Thailand's southern Phang Nga province for signs of abnormality for nearly two decades. The 59-year-old is a former fisherman, and his experience and knowledge of the sea are why his coastal community in Ban Nam Khem village relies on him to monitor nearby waters after earthquakes.

Tsunami-hit nations will next week commemorate the more than 220,000 people who died in the Boxing Day disaster two decades ago, when huge waves tore into coastal communities around the Indian Ocean.An undersea 9.

California’s free earthquake early warning app, MyShake, is now available for Mac computers and Chromebooks — a major expansion of access for the warning system.