This giant grouper gets super close to the Gladius Mini, I was almost worried he was going to open his mouth and enhale the underwater drone. Goes to show that the Grouper can probably distinguish the drone between a living actual fish, however, I think if it was a shark, that may be a different experience. It all depends what time of season it is too, if it's spring time, spawning, and these fish are on the feed... You never know if a giant grouper like this might come along and try to take a bite out of the Gladius Mini. Very cool shot indeed! Posted by Tom Parker, be sure to subscribe to his YouTube channel.