Aquanauts stunned by underwater "smoke"?

[Caleb13]

IDK if this is bug or feature, so... if aquanauts inhale smoke on land mission, they can become uncounscious. The problem is, the same happens underwater too, which frankly doesn't make much sense, because they're wearing helmets. Wearing armor helps however, both Ion Armor and Mag. Ion Armor seem to prevent  the stunning effect. You can see it in the attached save, it's from the 2016/08/20 nightly.

[Starving Poet]

I wouldn't think about it too much - it's the same reason you can throw an item underwater that exact same distance you can throw it on land.

If you want some sort of story explanation - the silt thrown up from the underwater explosions blocks your regulators in the standard armors and you pass out from carbon dioxide poisoning.