Ocean waves of relentless approach have long been objects of apprehension and fear. From mariner folklore to literature to Hollywood films, oncoming waves — both outsized and unremitting — have been forces and symbols of, variously, nature unbound and social planning unprepared. How do coastal engineers and marine scientists understand such entities? This talk will center attention on how ocean waves become objects of measure, monitoring, and modeling and in the process, entities whose frightening dimensions might yield to prediction and control. The talk will offer case studies from wave research centers in the Netherlands, Oregon, and Bangladesh. Amplified waves emerge as avatars of the Thallasocene, forces and forms diagnostic of the age of a rising ocean.