The REV Ocean team has been researching these mysterious egg sacs, and have collected four samples from Norwegian waters so far this year.
"They were genetically tested, and turned out to match the 10-armed squid Illex coindetii (southern shortfin squid)," Halldis Ringvold, a researcher with Sea Snack Norway's Gelatinous Sphere Project, told The Dodo. "The jelly ball from the video ... has not been genetically tested, but is similar to the other jelly balls which have been tested."
The southern shortfin squid, found in the North Atlantic Ocean and the Mediterranean Sea, is between 8 and 16 inches long (not including their legs). They can somehow lay a giant sphere, around one meter (3 feet) in diameter, that's filled with eggs.