Rare's Sea of Thieves was announced last E3, but Microsoft showed off a much deeper look with some shared world gameplay. We also got a bit of a narrower window for the game's release.
Adventures happen above and below the waves, including exploring shipwrecks and finding proverbial sunken treasure. Players will work together to solve riddles and puzzles, while dodging enemies that are out for blood.
You can get a better idea of the gameplay by watching the video below. The game will be out in early 2018.