What helps cephalopods move quickly in water and escape from the enemy?

Cephalopods are amazing creatures. Their name speaks for itself. Their legs “grow” right out of their heads. Mostly, cephalopods include mollusks. The most famous representatives of this class will be: squid, octopus, cuttlefish. I know them all. So what helps them move quickly through the water column? What helps to escape from enemies and threats?
First of all, their body shape. It is streamlined, like a rocket. They cut the water like a knife through butter. With the help of tentacles, they push off and move. Nature has awarded them with an ink sac. At the sight of danger, they throw ink into the water and disorient the enemy. Themselves at this time carry their tentacles away.
Another way to quickly evade the threat is their ability to disguise themselves as surrounding objects.