Stop writing that letter to your congressperson asking for peace between those competitive astronauts – there's a story behind the add-on: "Returning from a research expedition, you witness a meteorite impact that cripples the life support capability of the settlement. With precious minutes ticking away, you and your team must repair and replace equipment in order to restore the oxygen production to the settlement."
In addition to the new mode, Moonbase Alpha's recent update includes a sandbox level for your wildest space-based fantasies. So, Mars and the Moon conquered. We're coming for Uranus next! [FIRED. - Ed.]