The ex-trawler carries up to 12 passengers and three crew and has what is said to be the biggest dive-lift in Scapa.

It is now taking provisional bookings for the centenary year: “Obviously we can’t give everyone the week including 21 June but we will try to be as fair as possible,” says the skipper.

The bookings will be finalised at the start of the next season, around April 2018, so if you’d like to mark the occasion it’s probably worth making contact soon.

www.scapa-flow.co.uk