A lot of Spanish ships sunk in the Caribbean and around Florida for various reason, storms (shuch as hurricanes), battles and even pirates. In addition to those wrecks, addtional vessels from later periods that traveled from teh West Coast through the Panama Canal were also lost, so there's a great of gold and silver lying hidden beneath the ocean floor. If only the oceans were receeding, making it easier to get to, but unfortunately it's headed in the other direction. Maybe oover time a portion of it may be found, but most of it will remain there forever.