Most probably Marco Queral will not forget this moment so fast. In the South Pacific he encountered an approximately 15 metres long female humpback whale.
He said that the big mammals are extremely intelligent. Furthermore they have their own mind. The whales would decide if he is able to take pictures or not. If they are not in the right mood he could not get into the right position. Pictures you can find here.
Queral has no fear of the whales. He said that humpback whales are normally more shy and cautious towards humans and he believes that they are gently by nature.