Joseph Ryan and his brother David died when their fishing boat capsized off the coast of Newfoundland. Their widows and dependents received compensation under the provincial Workplace Health, Safety and Compensation Act(WHSCA). Section 44 of the WHSCA bars other claims by a worker (or a worker's estate or dependents) where compensation has been paid under the statute. The estates of the brothers did want to sue other parties in proceedings under the federal Marine Liability Act (MLA): the builder of the vessel for negligence in design and construction, and the federal government for negligence in inspection of it. Were these claims barred by section 44?