Just got this off of their site :-
Portsmouth to Caen - Caen to Portsmouth
We’re sorry to advise that due to a technical problem with one of its propellers, Mont St Michel needs to go into dry dock for repairs. Consequently, the following sailings are cancelled:
12/09/18 Caen to Portsmouth 14:00
12/09/18 Portsmouth to Caen 22:00
13/09/18 Caen to Portsmouth 08:30
13/09/18 Portsmouth to Caen 14:45
13/09/18 Caen to Portsmouth 23:00
14/09/18 Portsmouth to Caen 08:15
14/09/18 Caen to Portsmouth 16:30
14/09/18 Portsmouth to Caen 22:45
15/09/18 Caen to Portsmouth 08:30
15/09/18 Portsmouth to Caen 14:45
15/09/18 Caen to Portsmouth 23:00
16/09/18 Portsmouth to Caen 08:15
16/09/18 Caen to Portsmouth 16:30
16/09/18 Portsmouth to Caen 22:45
17/09/18 Caen to Portsmouth 08:30
17/09/18 Portsmouth to Caen 14:45
17/09/18 Caen to Portsmouth 23:00
18/09/18 Portsmouth to Caen 08:15
We are contacting all affected passengers to provide advice and alternatives.
That’s some cancellations, causing havoc at our place !!