Massive stars end their life with the gravitational collapse of their core and the 
formation of a neutron star. Their explosion as a supernova depends on the revival of a 
spherical accretion shock, located in the inner 200km and stalled during a few hundred 
milliseconds. Numerical simulations suggest that an asymmetric explosion is induced by 
a hydrodynamical instability named SASI. Its non radial character is able to influence 
the kick and the spin of the resulting neutron star. The SWASI experiment is a simple 
shallow water analog of SASI, where the role of acoustic waves and shocks is played by 
surface waves and hydraulic jumps. Distances in the experiment are scaled down by a 
factor one million, and time is slower by a factor one hundred. This experiment is 
designed to illustrate the asymmetric nature of core-collapse supernova.