No disrespect to any of you but as there still seems to be conflicting answers I did abit of digging and found the following which rings a bell as to what I was taught:
i. The daily rest period may be interrupted, but only twice, allowing the vehicle to be driven on to a ferry and off at the end of the sea crossing. However, this will depend on the length of the ferry crossing
ii. Any interruption in rest must be as short as possible and must exceed no more than 1 hour
iii. Where the rest period is interrupted in this way, the total accumulated rest period must still be 11 hours.
iv. During the rest period, the driver(s) must have access to a bunk or couchette
v. Time spent on a ferryboat or train which is not treated as daily rest can be treated as a break