That is a great video, and the guys in the boat were lucky not to be dumped overboard by the whales, who appear to be having fun playing with the boat, and terrifying everyone.
The whole episode must have been very scary for the poor divers though ! I would not have wanted to be out there with a whale that close, that is for sure.
You would have thought that they would have noticed the whales before they got so close to the boat and divers, since they usually are surfacing, and these seemed to be playing and having fun.