Photographer Miguel Pereira filmed an enormous sunfish swimming up to him and other divers off the coast of Portugal (video below).
The video was filmed on Sept. 26, 2013, but was posted on YouTube on Oct. 11. Pereira wrote: "The Sunfish seemed not to be bothered by our presence at all and followed us for 15 minutes."
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According to Uproxx.com, a sunfish can grow between 545-2,205 pounds, but is not normally seen in open water dives.