Fire is useful. It generates heat to warm your house or cook your food, or to lights the fuses of your bombs. It's also handy if you can start a fire underwater and take it to the surface, so you can light someone's ship on fire (don't worry, we covered it in pitch, earlier). So how can mermaids generate fire?

Note these are pre-industrial mermaids. They do have basic electrical sciences via their breeds of electric eels, and advanced gas understanding. They can make pressure vessels out of copper alloys.


Part of the question is what fuel you can use. The mermaids do have gas tanks. So could it be O2 and hydrogen? Or Methane, or acetylene? The latter one turns into a toxin when mixed with water, so may not be ideal for mermaids.


After you have the fuel, how do you make it burn and keep it burning? Most of their technology is at the level of the 17th century or less. Could their electric science be advanced enough to create some kind of battery to create a spark?


Depending on what is chosen for the other two... what will this fire be safe and practical to use for? Could it be used for lighting in the midnight zone? Would it be safe to use for cooking or will it blow you up?

  • $\begingroup$ One question per post, please. $\endgroup$
    – L.Dutch
    Feb 20 at 10:55
  • 2
    $\begingroup$ I'll write an answer later today when my shift ends, but my answer on mermaid architecture may provide a seed on how to go about this. $\endgroup$
    – Mermaker
    Feb 20 at 11:20
  • $\begingroup$ @L.Dutch Hi, Dutch! To clarify, it is one question. I am asking for details to be elaborated in the answer, but they seem reasonable? If you make fire, you will have to use some fuel, and some method of ignition. I could separate it into three related questions, if you really think that's necessary, of, "if mermaids created fire underwater, what fuel would they use," and etc. Is that necessary? $\endgroup$ Feb 20 at 11:53
  • $\begingroup$ I'm curious how do mermaids discover fire🔥? A culture don't spontaneously make fire so maybe this detail will help us get familiar with your mermaids and result in high quality answers. 🤔 Maybe. $\endgroup$
    – user6760
    Feb 20 at 12:20
  • $\begingroup$ @Mermaker Looking forward to it! That was a good post, upvoted it. Will note my mermaids have islands, but not all do. Some are adapted to live mostly in the twilight and/or midnight zones. I have ideas for why I think this would be. Would be fun to discuss that or other facets in a chatroom, if people are interested. Would love to discuss mermaid cities with you, and how they use currents for power, sanitation, and oxygen. $\endgroup$ Feb 20 at 12:21


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