how do underwater flares (or matches) maintain a flame or light when they are surrounded by water?

Question

Just watched Crawl (2019) and got me thinking.

Edit: i should clarify, why do they not extinguish like a normal flame.

In: Technology

Answer 1

Probably use a self oxidizing chemical reaction. Once you supply an ignition you need heat fuel and oxygen for fire to burn so as long as you have all three you can have