The court made several non-binding observations: (1) Research has failed to uncover any successful salvage claim by a port authority for removing a vessel which was an obstruction in its port in the past forty years. (2) If a port authority exceeds the normal scope of its statutory or common law duties in carrying out a salvage operation (for example, where the operation requires extraordinary skill or courage, or places personnel at unusual risk), the possibility of salvage reward is not wholly excluded. To the extent that the dangers and complications facing the salvor exceed the call of duty, salvage reward may still be available. (3) The port captain's discretion under Regulation 22 may properly take into account factors such as the degree of danger, complexity of the task, extent of available resources, and degree of deviation from normal duties when deciding whether to undertake services or impose conditions. (4) Although salvage operations are inherently dangerous to ship, crew, cargo and salvors, the port captain is empowered to refuse services or impose appropriate conditions based on the circumstances. (5) The derivation of salvage law from the Roman law principles of negotiorum gestio is, at least in English law, doubtful. (6) To the extent that services do not exceed the call of duty, a port authority may claim compensation provided for in its Tariff Book, even if not entitled to salvage reward. (7) The Convention was intended to bring traditional salvage rules up to date with modern practice and to address environmental protection concerns, but was not intended to set out the law of salvage in any exhaustive manner.