1. Scapa Flow is a body of water in the Orkney Islands of Scotland. It is known for its historical significance, particularly during both World Wars. During WWI, it served as a base for the British Grand Fleet, and in WWII, it was the site of the scuttling of the German fleet. Scapa Flow offers excellent diving opportunities, with many wrecks still accessible underwater. The surrounding area also boasts beautiful landscapes and opportunities for outdoor activities.

2. There are no specific working hours for Scapa Flow itself, as it is a natural body of water. However, if you are interested in visiting the surrounding area or taking a diving tour, it is best to check with local tour operators or visitor centers for their operating hours. Contact information can usually be found online or by calling the Orkney Visitor Centre at +44 1856 872856.

3. There is no entrance fee for visiting Scapa Flow itself, as it is a natural body of water. However, if you are planning to take a diving tour or visit any attractions or museums in the surrounding area, there may be fees associated with those activities. Transportation to the Orkney Islands is typically by ferry from mainland Scotland, with various ferry services available. Once on the island, you may need a rental car or use local buses or tour operators to explore the area.