After watching the video, I think the rear strap was raised by thr crane, thus causing the front strap to slip. If you watch closely the rear lifts pretty far before the forward strapp ever moves.

hmmm, says in the video info that a cable snapped

Here's another

Whoever runs break.com is a dumbass. They always get crap wrong. (Cable break.) It's hard to see exactly what happened since there is something obstructing the view. It almost looks as though it spun a little too far clockwise and touched the big ship's gunwale, which may have taken some weight off the rear strap or been just enough to make the front strap unstable and quiver, and ready to slide aft.

Oops!

The best quote on Break under the video
"haha to you poor people that's a yacht, to me it's the boat I use to get from the shore to my yacht, when there's no helipad available."

Why would anyone type that????

It is funny if you are 13. I laughed & I'm 32.
Don't you ever sit on your boat & wonder what the poor people are doing?

WE ARE THE POOR PEOPLE

There were no Cleats to tie the straps off on??

kinda what i was thinking. If no spreader anchor the lifting straps to the cleats. Would have been a pretty simple safety,