This mod adds corals, plants, sea anemones and many other things to discover to the oceans of Minetest. 3 types of nautic doors can be crafted, for example to build modern and historic ships.
Wilhelmines Marinara
adds water structures and coral reefs to the oceans of your world
Work in Progress Mapgen / Biomes / Decoration Survival
New ocean
Ocean made beautiful. New blocks, new corals, new everything. Love it.
Wow
It is basical what MT needs... discover, explore.