Just when you thought that Rocket League couldn't get any more exciting!
The underwater encased arena has dropped onto consoles and PC in all playable modes. The arena itself is free, however there are a few cars to buy if you are so inclined, They are the Proteus, and Triton which are being listed for $2 which is about £1.59 here - though exchange rates could have this costing £250 by the end of the day...
There are some nice new trophies to nab so just turn the game back on and lose yourself for another few hours. We'll assume you've checked out the basketball mode, right?