>>11953709Here's my idea:
A row of muscle rings are joined together by the mantle. These muscle rings can deform into ovals, and by contracting different regions of the muscle rings, they can change the rotation of their oval forms. As the muscle rings change the rotation of their oval forms jointly, they create a rotating double-helix vortex-shaped cavity within the mantle. This rotating shape causes pressure to drop inside the mantle, and draw air from the posterior air intake. Air, which is now in motion, continues to gain pressure and velocity as it travels along the rotating cavity inside the mantle, until it is expelled out at high speed and pressure at the anterior by a jet orifice, which propels the squid forwards.
