He took his girlfriend to a cruise dinner date. Organised the crew for the two of them to climb the mast. The lady got no clue that he'll be proposing at the top of the mast and that it's being candidly captured by cameras from the distance.
With the cheering crowd beneath them, he received the BIG Yes! And after the big hug and the big kisses, that was the time when he told her to wave hands to the camera.:-)