The oceans cover 71% of the earth's surface, and almost all of that water is more than 1km deep. Until recent years, mankind did not have the technology to begin exploring beneath the waves in earnest. Indeed, we have been so limited, and the oceans so vast, that we know more about the surface of the moon than the deep sea. We have always been ready and willing to explore the deep–but at long last we are now able.
A high profile "race to the bottom" ushered in the modern age of underwater exploration, and we are finally throwing some light on one of the world's last great unknowns. Modern science is finding more than just old wrecks and new species in the deep–it is finding answers to complex problems, and a deeper (pardon the pun) understanding of the planet that we live on.