In his lecture the Dutch philosopher René ten Bos speaks about the philosophical tradition of the concept of water and our relation to water from a philosophical perspective. This indifference and hatred of water and, more specifically, the sea is part and parcel of the history of Western philosophy. René ten Bos discusses this thalassophobia at length and also provides an explanation for the rather paradoxical fact that mankind in spite of this phobia and hatred actually did venture to sail the seven seas.