This was only three or four months after the Boxing Day earthquake just off the coast of Sumatra. One of the people I was travelling with, who lived on Penang, explained to me that the concrete blocks, which must have weighed well over a tonne each, had been swept away by the force of the tsunami that followed the earthquake.
I looked at the concrete, and struggled to understand how a wave could do this.
Watching the television news today, things become a little easier to understand, but no less shocking.
The wave in Japan was filmed, presumably by a helicopter news crew.
Unstoppable. Relentless. Devastating.