How does an octopus move?

After the terrifying video of an octopus making an escape from a fishing boat, and another that devoured a crab like a shark many wonder, how do these horrifying creatures even move? 

A group of scientists recorded and analyzed just how these slimy things get around.

We still are not willing to accept that there’s a science behind it, and these creatures are not simply controlled by the devil.

Screengrab via New York Times/YouTube