Due to bugs in original game files, Alien Habitat is absent in the game. The tiles that represent that item (chairs and flashing balls) are marked as Destructed instead (MCD files, special properties, offset 59 in the structure, the value 12 instead of 11).
If to repair this bug by patching MCD files, Alien Habitat is collected after a tactical game in the original game. There is not a special topic to research, so Alien Habitat is absent in the ingame Ufopedia. However, it appears in base stores, and it can be sold.
OpenXCom, unlike the original game, cannot see Alien Habitat even if marked as such in MCD files, so it is not collected after a tactical game. Placing a patch in the ruleset does not help, either.
Cf.
https://openxcom.org/forum/index.php?topic=2872.0 for a patch ready to test.
Please add a service of Alien Habitat to the game.
