the artic
The deepest parts of the ocean, known as the hadal zone, are the least explored areas on the planet. These include areas such as the Mariana Trench, the deepest part of the ocean, which has only been reached by a handful of manned submersible missions. The extreme depths, pressure, and darkness make it a challenging environment to explore fully.
The ocean and the underground. Humans have not completely explored them yet.
The deep ocean, specifically the abyssal zone (depths greater than 3,000 meters), has been the least explored due to its high pressure, darkness, and remoteness. Only a small percentage of this area has been mapped, and new species are constantly being discovered in these depths.
Very easily the ocean, specifically the ocean floor. Right now we are exploring it in what I would call pin pricks. It takes hours to sink to the bottom, we float around a small radius then come back up. Every time we go to the bottom, biologists estimate 1 out of every 2 species seen is a new discovery.
The abyss is the deepest part of the ocean that has not been explored. There is a movie that was made about it in the eighties I think.
As of right now, scientist are not sure which shark species is the least common. with around 95% of the ocean not yet being explored, overall it is hard to answer this question.
The Pacific Ocean
in 1968
Challenger deep is in the ocean, it was never explored by spacecraft.
The Ross ice Shelf is a floating ice shelf connected to the Antarctic continent, that is about the size of France. The ocean under the shelf has never been explored.
The least explored desert is Antarctica.
Approximately 5 of the Earth's oceans have been explored by humans, while a larger portion of the land has been explored.