I built a mine on a uranium deposit in my empire, and now an ocean space 4-5 tiles away has an enchanting green glow beneath the waters. Since I didn't see anything in the tech tree about seafloor mining, I'm assuming this is a bug. Spoiler : Fields of green... wait, wrong strategy game. The glow pulses and twinkles just like the uranium resource on land. So far this bug has survived exiting the game and reloading the save, so I attached the savegame to see if you guys can see it too. Patch version: 18.104.22.168. Edit: if you can't see it in the screenshot, it's near the center of the pic, directly down from the prow of the rightmost embarked transport unit, it's a pretty obvious green glow.