Oceanic planets are entire worlds covered by a gargantuan ocean that spans the mass of the entire planet. The oceans on these types of planets are hundreds of kilometers deep. These types of planets form as a result of an icy world settling into an orbit that rotates close enough to the star of the solar system to melt all of the ice on the planet. The pressure that is found at these massive depths is greater than any other oceans in the known universe. Despite this, there have been studies that show signs of life, even at these incredible depths.
The atmospheric densities on this type of planet are varying, which results in several possibilities in terms of climate and overall temperature. If the atmosphere is thicker and denser, this would result in constant clouds of water vapor, which would induce a greenhouse effect, thereby raising the humidity and temperature. Smaller oceanic planets have lower centers of gravity. On these planets, water evaporates more easily and the waves are significantly larger, which results in devastating tidal waves and tsunamis.
These planets provide one of the best outputs of organic resources, making them worth the effort to colonize for this reason alone. The oceans of these worlds provide the perfect conditions for aquatic life, including everything from plants to fish. These planets are easily colonized using advanced platforms and floating colonies tethered to undersea facilities. Building and maintaining such a facility is costly, but the funds are easily made up by the continued organics production quality.