They're called "Sunfish." They're also known as the worlds's heaviest bony fish in the world and they spent their entire lives most in the open ocean (temperate and tropical oceans around the world), because of that, encounters of these gigantic creatures are rare and few.

Though the divers looked so little swimming beside the sunfish and as if it's enormous size seems like he can eat them up, the sunfish is a harmless creature. The divers also enjoyed every minute of it by taking pictures and capturing this amazing encounter in videos.

Check out this video and be amazed with this ever elusive sunfish.