The estimates of scientists around the world are alarming: by 2100, the rise in water levels will vary between 50 cm and 2 meters depending on the coastline. 90% of the world's coastal cities are affected. But the threat is multiple. Not only is the sea level rising, but the storms that accompany it are increasingly violent, the salt of the water is destroying the land and the force of the movements is eating away at the soil on which these cities rest. An army of scientists is on the move, like thousands of soldiers in battle order, to find solutions before it is too late.