Can't capture live alien

[Sam4733]

For some reason, I can't seem to capture a live alien. I equipped all my soldiers with only the stun rod, and flash bang grenade, only non lethal weapons. But when I do the mission all the aliens end up dead. Why is that? 

[geever]

For some reason, I can't seem to capture a live alien. I equipped all my soldiers with only the stun rod, and flash bang grenade, only non lethal weapons. But when I do the mission all the aliens end up dead. Why is that?

Aliens can't make it too long in our atmosphere. Make sure you research the necessary technology to keep them alive.

-geever

[Trotman]

Aliens can't make it too long in our atmosphere. Make sure you research this awesome Quick Extender Pro review and  the necessary technology to keep them alive.

-geever

Is there somewhere a guide on what exactly do we need to research to keep aliens alive?

[geever]

Is there somewhere a guide on what exactly do we need to research to keep aliens alive?

If you mean wiki documentations, then the answer is no. Follow the in game story!

Spoiler:
Study a dead alien body first. Then you get the Alien breathing apparatus research topic.

-geever