Wow. We have a "Queensland" Grouper here .. similar size to the goliath, but there is no way I would hug it. A mate was a skipper of a dive boat and went for a freedive on their break - got a little bit too close to one that was chilling under the vessel. It opened it's mouth and sucked their head in. Happened very quickly. This person has a pretty decent breath hold, and experienced all round. But they thought that was it - all over. Until they were promptly spat out - never to venture within 10m of a fish that size again.