https://wccftech.com/sea-of-thieves-patch-1-1-6-deployed/

Sea of Thieves patch 1.1.6 is currently being rolled out on both Xbox One and Windows 10 PC, which will introduce the new Sunken Curse Bilge Rat Adventure.

Rare has taken the game’s servers offline to implement the update, and carry out necessary maintenance. The servers are expected to be back up at 2PM BST.