If your last Sub Terra adventure didn't end as planned and some friends were left behind, don't despair! A mysterious corporation is willing to lend you a hand (and maybe some new tools) to return to that sinister cave and rescue the lost ones. Sub Terra: Investigation arrives to spice up the exploration with 15 new item cards that will boost your characters' abilities. Think of them as power-ups you can find scattered around the map, or, if you're the more direct (and perhaps a bit ruthless) type, you can choose the Agent, a character who starts the game fully equipped. The darkness within is treacherous and full of surprises, so it's good to be prepared for whatever comes. This expansion adds more tension and tactical options to the original cooperative game, maintaining the vibe of exploration and escape against the clock. Get ready to dive back into the depths, but this time, with a clear objective: bring everyone back safe and sound (or maybe not so much!). It's a chance to relive the adrenaline, but with an extra touch of strategy and powerful items to help you on this dangerous mission.