According to the March 1998 executive summary from the office of the chief scientist at NOAA, the earth's last unexplored frontiers are the oceans.
Man-kind has explored nearly every corner of our planet above sea level. Humans have crossed every desert. We have climbed nearly every mountain and have explored the skies and even the space beyond it.
Through all of this, we have yet to make significant progress with the exploration of our oceans. Today, more than eighty percent of Earth's oceans have not been explored. This is due in part to the vast volume of oceans on Earth, but mostly due to the immense pressure and darkness you are subjected to when attempting to explore the depths of the ocean.
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