Human civilization has made enormous steps on the path of technological and scientific advances through history.
It was still almost a decade before man first set foot on the moon. But when Lieutenant Don Walsh traveled underwater for seven miles to reach the deepest ocean on Earth, he could never have imagined that his remarkable feat would never be repeated. In fact, no one has even tried. Now, 50 years on from his historic voyage to the bottom of the Mariana Trench the deepest ocean on [...]