Mega Shark vs Giant Octopus is a film by Asylum Studios. Like most of their stuff, it's hardly worth watching seriously; no one involved in the production of this festerboil of a SyFy Original expected it to amount to anything artistically, and it shows.
It is however noteworthy for abandoning physics altogether for the climactic and well know "Mega Shark vs Plane" scene.
MSVGA is a notorious hotbed of the SCIENCE! mentality, which accounts for the second and last redeeming element.