Being developed by a three-person Finnish studio calling itself Sleepy Sentry, Stirring Abyss is based on
The Temple, a 1920 short story by HP Lovecraft about a German submarine that comes to grief during the First World War. In the game, it's the USS Salem that sinks to the bottom of the ocean during the early years of the Cold War, after which it falls to you to take control of the surviving crew, figure out what happened (and what's going on with these mysterious underwater ruins), and ultimately--hopefully--escape.
There's an element of XCOM to the game when you're exploring outside the sub, with turn-based movement and combat against an array of undersea weirdos determined to do you harm. Your weaponry is very basic--daggers and spearguns and the like--but as the story progresses, you may also be able to subject your crew to "powerful but grisly mutations" that will increase the odds of their survival, at the cost of their humanity.
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