What alternatives for fire can an aquatic sentient species use?

Since fire doesn't burn under water aquatic alien sophonts will use alternative technologies.

The question is, which alternatives to fire can they use? I am interested in all aspects of fire, (heat, light and quick method of chemical reaction with oxygen), although they may incorporate different methods i.e. for heat, a different method is available, for light, some other possibility and some other choice for burning things in oxygen, if dry fire (like we have on the surface) is not available.

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What alternatives for fire can an aquatic sentient species use?

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