5. BLOCKSHIP TABARKA, SCAPA FLOW, ORKNEY, SCOTLAND

The Tabarka is one of the three remaining blockships that were originally sunk in Burra Sound, Scotland to stop enemy vessels from being able to access the Flow. She is upside down and has numerous entry points for ambitious divers.

This shipwreck dive is not for those who don’t enjoy cold water, but it’s worth braving the temperature as the inside of the ship has been described as an “underwater cathedral”. Every surface is coated with a myriad of colourful anemones that are fed by the strong current.

This wreck can only be dived at slack water and the timing needs careful planning, but the rewards can be huge.