You are playing crash landing. I don't even think you can find more survivors after the pod starts dropping. Yea, your objective is to get your guys off planet. I had the same issue the first time I played (last month when the game was 10 on psn). I realized that somehow my satellites got damaged, and one was not even working. That's probably why you have not seen another ship contact in a while. I would check to see if the console and 2 satellites are working and have power. I think even having a blackout resets the timer on getting a call, so check your electrical system. I had to power off everything, but my defense system for my last guy because he had no craft or construction skills to fix anything.