WARNING: Video features graphic footage of white sharks feeding on a seal.

National Geographic recently posted the above preview footage from the upcoming November 7 episode of Great Migrations, which features some dramatic footage of white sharks feeding on a seal. The narration plays up the drama a little bit with its foreboding tone and lines like “gruesome collision” and “feast for one and death for another.” However, the footage speaks for itself.

UPDATED: As it turns out, this footage is indeed of an actual natural predation event that occurred at Isla de Guadalupe. Thanks to Andy Murch of ElasmoDiver.com for the information!

It is unclear as to whether what we see in the film was a true predation event or whether a seal carcass was dumped in the water to get the shot. The editing of the clip which features multiple sharks, (at least one of which does not appear in any shot with the seal carcass) and the up-close nature of what appears to be the initial attack on the seal make me wonder if the seal was already dead when the first shark bite occurred. If anybody who worked on this footage could share some insight on the event, your comments would be greatly appreciated. Regardless of whether it was the result of predation or scavenging, the event produced some amazing footage. (see update above)

The episode of Great Migrations premieres on National Geographic Channel on November 7, 2010 at 8PM.