a) Before the cruise starts: if execution of the cruise is materially made more difficult, jeopardized, prevented or impaired as a result of extraordinary circumstances that were unforeseeable at the time of entering into the contract and for which Amadeus is not responsible, then the tour operator or Amadeus may cancel, delay or alter the cruise prior to the start of the cruise, and Amadeus shall not be liable for such cancellation, delay, alteration, or other inability to perform. Such circumstances include war, strikes, civil unrest, epidemics, and government directives (such as requisition of accommodation or of means of transportation), embargoes; natural disasters, and accidents; and damage to the vessel (especially to the hull and engines, etc.) or other occurrences that are equivalent to the examples mentioned above in their effect (force majeure). The cruise fare, and/or a pro-rated portion thereof, received by Amadeus from a passenger shall be applied as credit for a future cruise.
b) After the cruise has begun: if the circumstances specified above come about after the cruise has begun then the tour operator or Amadeus may cancel, delay, or alter the remainder of the cruise, and Amadeus shall not be liable for such cancellation, delay, alteration, or other inability to perform. In that case, Amadeus shall, as a consequence of the cancellation, take the necessary measures and see to the return transportation of the passenger insofar as that is agreed in these Terms and Conditions and the Terms and Conditions of the Passenger Ticket Contract and is not precluded by the force majeure circumstances. If the contract is terminated Amadeus has the right to a claim only for reimbursement of the costs of the services that have been provided. The passenger must bear the additional costs of the return transportation and/or other necessary measures.
c) Changes in the water level: unusually low or high river water levels may cause changes to the itinerary, possible re-embarkation on another vessel or transfer(s) by coach or rail, or even to a shortening of the cruise. Amadeus, the tour operator and the vessel’s captain sometimes have to take such decisions quickly. Such measures may not justify cancellation, termination or withdrawal from the contract by the passenger; and passengers may not derive from them any claims on the tour operator or Amadeus, including, without limitation claims for monetary damages.