The Atlantis is a reminder of the kind of hydrological turbulence that can humble Empires! Constructed out of single length 45x5mm boro, this is one of the most solid, over performing designs of the product line. Coupled ratchets propel bubbles into a an alternating turbine vortex. The centripetal force of the top turbine keeps water down in the tube and not on your chin. This is four percs without a splashguard, putting the value of this tube beyond the rest.