Only about 20% of the ocean’s depths has been mapped by humans. Here’s what we do — and don’t — know about the deep seas and why studying them is so risky.

There is, however, currently an effort underway to create a definitive map of the ocean floor, called Seabed 2030. Still, there are huge gaps in what’s known of the deep sea.

When it was published in 1977 by Marie Tharp and Bruce Heezen, two oceanographers at Columbia University, there had never before been a map of the entire ocean floor. Here, for the first time, was ...

It would take nearly 300 years — in the aftermath of the Titanic disaster — before sonar technology began to offer scientists a clearer picture of what lies in the ocean's depths.A major step ...

The average ocean depth is nearly two and a half miles, and oceans cover 70 percent of the planet. Do the math and, in terms of total volume, 99 percent of Earth's biosphere is essentially unknown.

The map is the 4.0 version of the International Bathymetric Chart of the Arctic Ocean (IBCAO), an initiative that was created in 1997 in Saint Petersburg (Russia) in order to map the depths of the ...

There is, however, currently an effort underway to create a definitive map of the ocean floor, called Seabed 2030. Still, there are huge gaps in what’s known of the deep sea.

The map is the 4.0 version of the International Bathymetric Chart of the Arctic Ocean (IBCAO), an initiative that was created in 1997 in Saint Petersburg (Russia) in order to map the depths of the ...

What we know about the ocean’s depths — and why it’s so risky to explore it. ... currently an effort underway to create a definitive map of the ocean floor, called Seabed 2030.

What we know about the ocean’s depths — and why it’s so risky to explore it. ... currently an effort underway to create a definitive map of the ocean floor, called Seabed 2030.