As part of an upcoming change of scenery in a Star Wars (legends) RPG, our party, including a 3PO-series droid are off to a planet covered almost entirely in water. It's fairly relaxed, but we like to stick to the given knowledge of the Star Wars galaxy where possible.

In Empire Strikes Back, we see that R2-D2 can function underwater, even if he does get a little waterlogged, but I can't assume that C-3PO (for example) would fare similarly.

My question is; could protocol droids like C-3PO survive being submerged in water? Are there examples of this happening in novels, TV shows etc. I might have missed? I'm happy to take Canon answers if there is nothing in Legends.

  • Considering the design probably not if he existed in our world but in the Star Wars universe it could go either way.
    – TheLethalCarrot
    Commented Feb 13, 2019 at 10:25
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    we've seen him several times in snowy terrain in canon (tv / film) - reasonably, some of the snow would get into the exposed areas of his body and melt - granted, that's not quite equivalent to submersion but...
    – NKCampbell
    Commented Feb 13, 2019 at 15:54
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    Given you have an example of a droid functioning fine after being submerged and no examples of droids ceasing to function due to water occam's razor suggests it would be fine to assume that all droids are water resistant.
    – Chris
    Commented Feb 13, 2019 at 18:26
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    @Chris - Extrapolating a trend from a single point of data is a whole different fallacy
    – Valorum
    Commented Feb 13, 2019 at 18:37
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    @VBartilucci - There's a huge difference between submerging an electrical device into oil (youtu.be/ThUEwlmSeV4?t=245) and into water (youtu.be/7D7aUFMozOc?t=118)
    – Valorum
    Commented Feb 13, 2019 at 20:42

1 Answer 1


There's a (Legends) reference in Legacy of the Force IX: Invincible to a protocol droid happily walking through wind and rain. Obviously this isn't the same as waterproof, but it does imply water-resistance

Kell stared out into the darkness, noted the clustered pinpoints of red light that floated in the pitch. He shifted on his feet as the lights drew closer—a silver protocol droid. He attuned his vision to Fate, saw no daen nosi. Droids were programming, nothing more. They made no real choices and so had no lines. The false sentience of the droid unnerved Kell and he cut off the perception.

The anthropomorphic droid strode through the wind and rain to the base of the landing ramp and bowed its head in a hum of servos.

“Master Anzat,” the droid said in Basic. “I am Deefourfive. Please follow me. The Master awaits you.”

and again, in The New Jedi Order: Force Heretic II: Refugee. Note that Threepio seems entirely unfazed even when the rain comes down in "great sheets".

Han and Jaina also turned to look at C-3PO now. As if in response to the droid’s words, a peal of thunder rumbled from the tropical sky. Fat raindrops began to splatter his metal cranium, turning what dust was there to a reddish mud. “Threepio, are you sure about this?” Leia asked.


Rain began to fall in great sheets across the stadium as the sides of the troopships opened, issuing ramps. Jaina squinted to see through the rain, trying to make out what lay inside.

And in the 1983 Marvel comic story Ellie (Star Wars #80) C-3PO is seen standing in rain.

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    I think I recall the context of those frames, and can hear him repeating the words "We seem to be made to suffer. It's our lot in life". The fact they can tolerate heavy rain is promising, we might send him for a swim yet!
    – user107907
    Commented Feb 14, 2019 at 8:02
  • As there might never have been an example of poor 3PO going for a swim (we humoured he'd sink like a rock), we're going with this as a good indication that they might work underwater, but we won't actively encourage them to do so!
    – user107907
    Commented Feb 21, 2019 at 12:00
  • @Kozaky - He'd definitely sink, if the fact that he sinks in oil is anything to go by
    – Valorum
    Commented Feb 21, 2019 at 13:35

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