A wave in a natural environment: sea, lake, rivers or any water body in the cities. A floating atoll without concrete pool and water filtration system. 
A wave every 15 seconds, hollowing and barreling.
A 30 seconds ride and, in a specific setting, an endless artificial wave.
A nature inspired technology, economic in energy consumption
with no impact on the environment. 
An artificial reef for the natural aquatic fauna and flora.