Emerald Aquatic Caves

This is going to be a new structure with 2 houses like each one, there would be 2 pistons, 2 chests, and 1 crafting table in each one, and a lantern, and there would be good loot, and in those 2 pistons there would be water channel where the pistons would be closed and you would have to open or break them and there inside there was a cave with magma, emerald corals, lichen moss, moss flower amethyst stalactites and tuff And the specialty is that there would be emeralds, coal or iron and also the part of the exit there was a moss tree, some lichen, azaleas and inside it would be possible to pass with a boat and there would be water and that would be like a water toll but without paying