The sea cave would be a new biome spawning deep in ocean depths. They would be massive open spaces filled with water that would have a few openings leading to it from the sea floor. Inside there would be massive columns leading up to the ceiling. New clam mobs would also spawn exclusively in these caves. The walls and ceiling would be dotted with gems. Gems would be naturally generated ores that glow underwater providing an underwater light source.
If you like this idea and want it to be added to Minecraft, please vote or let me know what should be changed about it to make it better. Thanks for reading!
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