Ocean Ruins

Underwater ruins are structures primarily composed of stone bricks or sandstone, that generate in oceans or rarely exposed to air. They come in many different sizes varying from large villages to single ruined huts. Each structure contains a hidden treasure chest with loot inside. They come in cold and warm variants.

Generation
Cold underwater ruins generate in cold and frozen ocean biomes, as well as their deep variants which are composed of stone materials. Warm underwater ruins generate in warm, lukewarm, and deep lukewarm ocean biomes which are composed of sandstone and stone materials.

Structure
Underwater ruins are primarily composed of stone bricks and sandstone variants, although they also contain cobblestone, mossy cobblestone, polished granite, polished diorite, prismarine, sea lanterns, terracotta, glazed terracotta, bricks, wood planks, gravel, and magma blocks. The shape and size of underwater ruins varies greatly, and they will often generate together in groups to create ruined villages.

One may access the individual structures by using structure blocks to manually load them from the  folder in minecraft.jar. To do so, set a structure block to Load mode, enter, and press LOAD.

An incomplete list of all the structures with their filenames, descriptions and what they consist of:

Gallery
Unterwasserruine Ruines sous-marines 水下遗迹