We have just one boring type of airlock. I have ideas for upgraded airlocks, without taking away the current airlocks. You should be able to upgrade to more advanced types of airlocks. Tier 1- The current airlocks. Tier 2- Smart airlocks: They can be set to auto-open when both sides are pressurized with breathable air, and auto-close when one side is no longer breathable. This would be useful for space bases that are sectioned with these airlocks in such a way that when someone makes a breach in one section, the airlocks around that section close, keeping the rest of the base habitable. Tier 3- Forcefield airlocks: Airlocks that generate a forcefield that keeps the air in. Useful for hangar bays and areas where you want to look at and go outside without having to make a compression chamber. Can also automatically activate and deactivate the same way Tier 2 airlocks would, except it would have a forcefield instead of a solid barrier. I really think that these should be added to the mod. Tell me what you think!