Model-host Petra Nemcova says she entered a 'meditative state' to survive 2004 tsunami

When the tsunami happened, Petra Nemcova managed to cling to a palm tree for eight hours before she was rescued.

Two decades after a devastating tsunami swept across South-East Asia, Petra Nemcova is recalling what, and who, helped her survive the storm.

The Czech-born supermodel spoke about her vacation-turned-nightmare with ABC News' Diane Sawyer in a segment that aired Thursday (Dec 19) on Good Morning America.