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Naphta to lock gases


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The new visco-gel (with a tile gap so the dupes jump it) is probably the "best" air lock, although that's highly subjective.\

Personally, I'm fine with just a simple water-lock 90% of the time.  It's fast, easy, can be set up at any point in the game, and never fails.

Naphta locks were either an unintended bug when plastic was introduced or a sneak peak towards the later released visco-gel. Back then naphta had the property of stacking vertically instead of spreading horizontally like other liquids. This property was fixed quite some time ago, so naphta locks are no longer a possibility.

If you are looking for a similar thing then the recently released visco-gel does exactly the same thing. However it is very late-tech (requires rocketry, petroleum, etc.). To make up for it it shows some improvement in certain areas (better insulation for example). However it also has some downsides. It freezes at -30°C and is (still) rather hard to gauge.The biggest downside however is that the lock will break as soon as it gets into contact with any other liquid (e.g. dripping condensation/melting).

As mentioned by @Soulwind water (or any other liquid including naphta) locks are the short-term solution. It is essentially a small pond that your dupes have to dive through. Since gases cannot pass through liquid, it will completely lock in/out gases from one side to the other. Because of the properties of liquids in ONI, you will only need as much as ~3-4 tiles of water (only 1 being full) to create a lock. Downsides are slightly reduced runspeed when diving, soaked debuff (without exo-suit), moderate hassle to set up, might freeze/vaporize depending on temperatures and liquid used.

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