Video show on a vessel in heavy seas during severe weather conditions

I came across this above youtube video from Jalopnik.com given here  entitled "Watch Heavy Seas Bend and Twist a Giant Ship like Taffy" written by Michael Ballaban. It appears the video was taken at different parts of this giant cargo ship that really gave a clear indication regarding what was happening to the ship during the encountering of this heavy seas. Here as Ballaban tells it:

The Skagen Maersk is 1,138.5 feet long, and weighs over 100,000 tons. That sounds pretty big and strong. But when faced with some big waves, the whole thing undulates and groans like a bucking bronco. This is crazy. 

We've seen videos of big ocean swells before, but we haven't seen just what it can do to the innards of a huge, ocean-going vessel. The power of the sea puts massive forces on the ship, forcing it to bend to its will. Even deep in the belly of the ship, you can see one end of a corridor swaying back and forth. 

If I was on board, I'd probably jump off as soon as I could, because That Does Not Look Right. 

But everything is all right, according to the video, and big ships are designed to twist about in heavy seas, much like airplane wings bend in turbulence. If they weren't flexible, they would break. 

That doesn't make it feel any better though. I'd be putting on my lifejacket.

I guess one can not argue with video evidence of everything is all right. They knew that they were encountering the heavy sea. So just bracing to brave through it. One may wonders what might happen if it comes all of a sudden in generally calm condition, yes, when it encounters a freaque wave, would it still be all right? Let's hope it would be!