Rare footage shows a 'Dumbo' octopus more than 5,500 feet underwater, swimming with its ear-shaped fins

• Rare footage shows a "Dumbo" octopus swimming near a submersible in the deep ocean. 
• The animal was spotted more than 5,500 feet underwater by a research expedition. 
• The Ocean Exploration Trust's Nautilus mission ran into the octopus while live-streaming.

Rare footage shows an unusual octopus appearing in the deep sea, more than 5,500 feet underwater.