A dramatized presentation of the work of the Maritime Marshlands Reclamation Administration in the reclaiming of flooded agricultural regions along the Bay of Fundy. Through the account of a dike-keeper, the film describes the destruction that follows the breaking of long-neglected dikes during autumn rains and shows how M.M.R.A. engineers are cooperating with New Brunswick land-owners in the big task of keeping at bay the inundations of the sea.