From Press Release:
Available now on Steam, the update provides you with the opportunity to go ahead of our time, step your feet on the surface of Jupiter’s Europa moon, and dive deep into oceans hidden under its icy crust.
The brand new environment to explore – 4 square kilometers of Jupiter’s Europa – are believed to be the most promising place in our solar system so far to find traces of extraterrestrial life.
In addition to the new environment itself, you’ll enjoy 2 new single player mission, an online coop scenario, as well as some new and improved features – like new underwater mechanics or radiation simulation.
To accommodate yourself to the cold, low-gravity conditions of Europa, the update will also set you up with a warm new space suit, a diving suit, low-gravitation buggy, exploration submarine, and a spacious new habitat.
Along with the content package, we’re also releasing a good amount of fixes, tweaks and overall game stability improvements for the base game.