As I am off to a tropical island to live and work I obviously wanted to take my GoPro. I also wanted to try something different. I saw some split images that show both below and above water shots. After looking around I saw they were created using a dome port. I took a look on amazon and saw this one (link) for about £50. A little steep. I looked on the listing and saw the actual dome was only £10 (link). With the help of my father who created a 3d printed backing, we assembled the unit and it worked well. I capture these images down the local river. It works great but the cold water caused it to fog up quickly. Hopefully, in the warm tropical waters off Ascension, it will be fine and I can get some turtle and shark shots.