All the seas can teach, is depth
Harmonious with man stepping aboard floating vessels to traverse the bountiful oceans of the world are legends of colossal sea monsters such as the Kraken and Colossal squid, capable of destroying even the largest of ships and devouring the crew. The deep dark blue waters separating land masses of the world have captivated man since the dawn of time as they sustain life both in the sea and on land, but can be quick to take it away. To our knowledge like the heavens above, giant bodies of water seemed impassible to the depths for many thousands of years.
Even in the modern age, the task remains very dangerous and difficult, making Earth's oceans the largest unexplored portion of our planet by far. No wonder our ancient ancestors may have developed fears or felt intimidated by the deep blue, after all it was anyone's guess what lurked below on the way to a horizon which seemed to suddenly drop off into nowhere from a distance. Present day Oceanographers have put some sea fears to rest even-though a very tiny portion of what's known to exist has been uncovered. A single submersible visit to hydrothermal vents and underwater mud volcanoes in the Marianas Trench commonly finds many new, previously unidentified species. Life found here is capable of withstanding temperatures up to 300 degrees Celsius while being subjected to over eight tons per square inch of pressure. To discover life flourishing in the most hostile, extreme environments on Earth is encouraging to several disciplines of science, including those searching for life on other planets throughout the cosmos.
Robust life fills oceans of the world in many shapes and forms sometimes even considered alien-like by appearance alone. Taxonomy suggests 8.7 million species of life cover the entire planet and at least half of those species make their home in the sea. Recent estimates claim at least a million species have not been found or identified according the Census of Marine Life.