In the end it's all in God's hands; but I have seen many documentaries on nat geo or discovery where the world's best engineers and geologists have spoken about the natural stability of the gcc terrain... The waters are calm and shallow and for this reason, even if a tsunami were to approach the gulf from elsewhere, it would very quickly lose most of its force and speed before making landfall... Further, the gcc does not lie on any significant geological cracks/fault lines and the sub terrain tectonic activity is low... The gcc is one of the few areas on earth where these massive and ambitious construction projects, like all the man made islands in the sea and tall buildings, can be even attempted...Inshallah no tsunami will make its way here but at the same time, to say it definitely won't happen is to play god... They boasted that the titanic was unsinkable and we know how that scene ended...