Ahoy matey! Let’s set sail in the deep sea ocean. But how much do we know about what’s underneath there?
We’ve mapped 100% of our oceans at 5 km resolution using satellite radar.
If you account for shipping routes and scientific expeditions, we’ve mapped out about 20% with sonar.
What about the other 80%? The reality is that most of our oceans are totally untouched.
Here’s why we don’t know about ocean bathymetry. And why there’s a need for ocean exploration.
How to see the unseen ocean bottom
Even though 70% of Earth is covered by oceans, we don’t know much about the ocean seafloor. In fact, we’ve mapped our Moon, Venus and Mars better than our oceans. Crazy, isn’t it?
First, oceans are harder to map out. This is because satellites don’t penetrate through water well. Whereas the moon and other planets are completely without water.
If a satellite uses radar, it’s only good for measuring sea height. In other words, radar can’t penetrate through water. But the Lunar Reconnaissance Orbiter spun around our moon. It was able to map the surface of the moon at 100 meter resolution simply because the moon doesn’t have water.
If you want to capture ocean bathymetry and find the deepest points of the ocean, you’d have to use a boat carrying sonar. It sends pings downwards through water. The longer it takes for the wave to return, the deeper the height.
Overall, multi-beam sonar can capture ocean depth at about 100 meters resolution. But because this is only along a given path a ship travels, we’ve only mapped out about 20% with sonar.
The need for ocean exploration
Why does spending in space exploration far exceed ocean exploration? For example, NASA’s budget is a whopping $3.8B for space exploration. Whereas NOAA receives a sparse budget of $23.7M.
Although the objectives of space exploration are worth pursuing (origin of the universe, space experiments and habitable planets with life), deep ocean exploration has tons of potential for breakthrough discovery.
For example, deep ocean exploration is designed to understand how life evolves in different aquatic environments. Our understanding of life forms and evolution has advanced because of deep sea exploration.
Every year, the ocean contributes $1.5 trillion to the global economy. As climate change becomes a hotter topic, this is why we have to protect our marine environment which are core in CO2 sequestration and nutrient recycling.
The biggest drawback to studying our oceans is its high cost. For example, there’s serious risk to deep sea dives for health. This is why technology advances in deep-sea drones will unlock our ocean’s secrets,