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Thanks for answers. The cruise line we are looking at is Celestyal Cruises - specialists in greek island cruising. We are in Athens anyway, flights booked, so we are stuck with this departure port.
I have looked on cruise critic, but this line doesn't feature on their message boards. I am logged in but most of the lines are greyed out, only a few showing as accessible for messages. Pandemic related possibly.
I am still waiting for a written response from Celelstyal. Either on facebook or twitter, or a written query online to their customer services. Silence on all fronts. They are really good at calling you back, almost instantly, but the agent really had no idea, I don't think he'd been asked the question before.
I have established with our travel insurers that in the event of all of us being bumped, and the cruise line not offering a refund - which they don't - we'd not be obliged to take the reschedule due to its possible inconvenience - and we could claim for the cancellation.
They do have a passenger locator/health questionnaire form that you have to fill in, this is a normal procedure for norovirus, and on there it does ask if you have been in contact with/caring for someone with covid in the past 14 days. Which clearly you would have if one of your fellow travellers is positive. However, it goes on to say that this form is collected after you've boarded? Which makes no sense at all. Either they haven't properly thought this through, or the whole explanation has lost something in the translation from the original Greek.