Ocean water also cannot be converted into other liquids, such as poison. To build underwater and not have water spawn inside your structure, you must replace the background and foreground with blocks, then remove the foreground blocks and water will stop spawning.
All air below surface level is replaced with water. The water found on ocean planets is infinite, and cannot be drained. There are no environmental hazards in ocean biomes which require use of an environmental protection pack aside from deep oceans which can drown players not using a Breathing EPP. Ocean planets can be found orbiting temperate (orange) and radioactive (yellow) star types. Ocean planets are a 'risky' threat level, geared toward tier 3 in progression. The ocean floor is covered with plantlife, breakable shells, and possibly submerged ruins. Traversing the surface is best done with boats or by swimming. The surface of an ocean biome.Ocean is a primary biome type characterized by a vast expanse of water with small scattered sandy islands.