The Cave of the Wild Horses is the only known cave of any size in Co. Clare associated with a turlough. A description of the extensions to Gour Passage discovered in April 1983, together with a revised survey of the cave, is given. The new passages are phreatic in origin and may often be flooded. A tentative sequence of the formation of the cave, together with a review of the available information concerning its behaviour under flood conditions is also presented.