BBC two controller Roly Keating said it paid tribute to survivors' "courage".
"The 2004 Asian tsunami shocked and devastated the world, touching the lives of people everywhere," he said.
[RDN - Oh, yes, thanks for reminding us. We'd forgotten all about that wave thingy.]
"Since then, many questions have been asked and answers have been sought, but what this drama is able to do - through the searing writing talent of Abi Morgan - is to explore the cultural and personal fault lines that can be ruptured when catastrophe strikes.