🚀 go-pugleaf

 It's a very old game so I'm not sure if anyone can help but I
recently went back to play UFO - Enemy Unknown (as this was the name X-
Com was released as in England) on my ancient old P90 as I never
completed the game 1st time around. However I've come across either a
bug or maybe I'm missing something, I'm not sure. I've had my
scientists doing their research and have been told to capture one of
the alien leaders alive so that they can be interrogated to find where
the alien HQ is. The thing is, I sent in a team and captured a leader
from a base the aliens had set up on earth (which one of my aircraft
detected) but when I complete the mission, I get the message 'alien
dies as there is no alien containment facility.' But I do have an
alien containment facility in both of my largest bases! The team that
I sent out to capture the alien leader are from one of the bases that
has an alien containment facility and not from one of my smaller bases
that haven't, so I can't understand why I get this message.
  Could you help me please and tell me if I'm missing something or
have I come across a bug? I would love to finish this game as I have
put hours and hours of time into it and it is in my opinion, one of
the all time classic computer games. I know it's looking well dated
now but the gameplay still stands the test of time.
 I'd be grateful for any help.