Tower Two Survival?

[(XBOX)Koolster 998]

I have been trying to farm for the latron prime pieces before the vault seals back up, but I can't seem to get the keys. Where could I find them?

[Pavelord]

Hi Koolster, you find keys as rewards in excavation and survival missions, keys are guaranteed at certain intervals, and you have to make an apropiate difficulty mission for the level of the key, ex. survial in apollodorus will yield tower 1 keys; go to mid level missions for tower 2 and hight level for tower 3 and 4. I believe you get one key every 15 min. of survival and every 3 excavators completed, good luck.

[(PSN)Cwellann]

http://warframe.wikia.com/wiki/Void_Keys

 

I think Aegaeon, Saturn or Grildig, Phobos or Armoros, Europa might be your best chances.  They're all spy missions, with a limited number of key drops, and if you're decent at spy, you should be able to spam those and grab keys way faster than survival.  Excavation, it's probably about the same speed, but at least to me, the excavation drop tables looked a lot more diluted.

[(XBOX)Koolster 998]

Thanks!