For a limited time only, get SOMA free on PC from GOG.com. This is part of their Winter Sale giveaway which when last checked, you have about 43 more hours left to claim the game for free.
Enter the world of SOMA and face horrors buried deep beneath the ocean waves. Delve through locked terminals and secret documents to uncover the truth behind the chaos. Seek out the last remaining inhabitants and take part in the events that will ultimately shape the fate of the station. But be careful, danger lurks in every corner: corrupted humans, twisted creatures, insane robots, and even an inscrutable omnipresent A.I.