If an unforeseen event which could not have been avoided if all due care had been exercised impedes implementation of the trip to a major extent, endangers it or interferes with it, then either party can terminate the contract. Where Andorra Travel Service is the party affected by such an event, Andorra Travel Service will provide Customers with prompt assistance and take the necessary measures to bring Customers back to the place where their package started. Any additional costs will be covered by Andorra Travel Service. Where Customers are the party affected by such an event, Andorra Travel Service will not be obliged to refund them any sum for services which have not yet been performed. Customers will also be responsible for paying any additional costs associated with getting back to the place where their package began.