B.I.O.T.A. has 2 endings, a good and bad ending. Missing 1 critical action will default to a bad ending, here’s how to get the good ending. After getting to the radio outpost you’re charged with grabbing a Level 4 key. Once done you’ll get to a radio control center. This is before a room with 2 mines leading down, if you’re playing as anyone but Jade Fournier you’ll be told by the person she needs to send the message. Choose to play as Jade back on the surface and head back. Interact with the control console and you’ll trigger a cutscene. Beat the game and you’ll get the true ending.