In locations like Dubai there are enough rich individuals to bring about such an insanely costly and labor-intensive procedure as developing an isle. See the amazing images of this unbelievable technological innovation featDredging ships spray a specific type of sand (326 million cubic meters worth) onto one location in order to create the actual base of the island.
Needless to say, these man-made islands don’t come cheap. Even the sand has to be specifically chosen to stand the test of time. Some types of sand are too dense and would sink, while others are too light and would slowly blow away over time.