NOVELTY - The FUN tunnel consists of a system of pipes used to augment flows, the pipes being open pipes comprised of a converging entrance chamber, diverging then converging middle chambers, and diverging exit chamber resulting in a pipe with multiple constriction points creating a series of venturis with peak cross-sectional areas of the chambers decreasing from entrance chamber to the middle chambers to the exit chamber, thus generating a reduction of pressure and increase in speed in matter flowing over the length of the tunnel.    USE - FUN tunnel for e.g. electricity producing turbines, fuel injectors, blast furnaces, human produced waste exhaust, circulation systems, rivers, water channels, reservoirs, lakes, levies, dams, dykes, ocean currents, indoor and outdoor plumbing, irrigation, existing hydro electric facilities, drainage ditches, smoke stacks, steam stacks, flues, blowers, pumps, compressors, combustion engines, accelerating projectiles, pipelines, steam turbine generators, wind electric energy generators, liquid jets, gas jets, plasma jets, blast forges, shower head, transportation vehicles, household appliances, freezers, sewage systems, defoaming systems, coolant systems, sprinklers, fountains, public and private water systems, musical instruments, water mains, water towers, marine vessels, flood control, respirators, inhalers, smoking paraphernalia, oil and natural gas wells, atomizers, carburetors, kitchen appliances, wine aerators, protein skimmers, vacuum generators, vacuum cleaners, venturi scrubbers, sand blasters, bilge emptying systems, scuba diving regulators, vaporizers, geothermal heating and cooling systems, venturi masks, propulsion systems.    ADVANTAGE - The FUN tunnel increases the speed and reduces the pressure of matter flowing over a distance.    DETAILED DESCRIPTION - The position of the points of the peak cross sectional areas can change position along the length of the tunnel so long as the tunnel walls maintain the converging and diverging angles such that the pressure at one point that one venturi ends and another begins in the series is lower than the tunnel entrance pressure or the beginning of the previous venturi.    DESCRIPTION OF DRAWING(S) - The drawing shows the cross-sectional diagram of two FUN tunnels in an exit to entrance series.